Monthly Archives: May 2015

ISS Pass, May 31st

Tonight there was another pretty good ISS pass over Los Angeles at 22:02 PDT.

I’ve talked several times about how tough it is to get a good picture of the ISS over Los Angeles because of all the light pollution here. I would like to use a really long exposure, up to three or four minutes, in order to catch the ISS’s arch across the sky. But that’s hard to do since anything over about 30 or 40 seconds gets washed out and very overexposed due to all of the street lights. Instead, I end up taking and posting a series of 20 or 30 second exposures and then just publishing the whole series.

Online I’ve noticed a number of folks who have very nice pictures of ISS passes, but the image from the ISS is broken up like a dashed line, not a solid line. Today I asked one of them about it and confirmed what I had suspected. They’re taking a whole series of much shorter pictures, then using software to combine them into one. In astronomy this is a common practice called “stacking,” which we’ll talk about a great deal more as I start to play with it.

I downloaded some freeware that was recommended (thanks, @Steve_P_Knight) and instead of one or two 30-second exposures, I shot a series of thirteen images, each 5 seconds long, with about a half-second delay between each image. I then combined them using software into a single image. Since the only thing moving in the picture was the ISS (and that 737 going into Burbank), the combined image looks like this:

StarStaX_IMG_7902-IMG_7914_lighten_edited

It should be obvious which is the ISS and which is the 737.

This is a cool new thing to play with, a new tool in my amateur astrophotography toolkit.

Leave a comment

Filed under Astronomy, Photography, Space

Saturday Night At The Hollywood Bowl

If you visit LA and get the opportunity to go see a concert at the legendary Hollywood Bowl – take it! The sound system there is one of the best I’ve ever heard, you’re out in the fresh air, it’s got enough ambiance to choke a mule. We can even tell you how to avoid the horrific traffic getting in or out.

Tonight, not only was there a great concert, but at 21:20 there was a very bright ISS pass. I knew when it was and had an idea where it would be, so at the appointed time, as Tony Bennett and Lady Gaga were singing “The Lady Is A Tramp,” we watched the ISS rise behind us, pass the moon, and then head to the northeast right behind the bowl and the hills. It was fantastic!

The music was pretty awesome as well. Even if we were in the mid-range seats where the better view was on the high-def big screens. Remember, awesome acoustics and sound system. Great band. Tony Bennett. Lady Gaga. Tony Benett and Lady Gaga.

Great night.

IMG_9288

IMG_9296

IMG_9304

FullSizeRender

FullSizeRender (1)

3 Comments

Filed under Uncategorized

Lower Than What?

In which we revisit and update two of my favorite rant topics, idiot drivers and telemarketers. May there be a special level of hell reserved for the both of them.


Here’s the scene: 101 Freeway, southbound (by which I mean headed due east, but that’s a different rant) through Westlake Village. 55 mph zone and there are a fair number of vehicles filling the four lanes, but we’re moving along at 55 to 60. The #1 and #2 lanes are both pretty well packed, with a couple of late-returning holiday campers blocking my view of the #1 lane. #4 lane is full heading off into the distance. I’m in the #3 lane with cars behind me, but no one ahead of me for quite a ways.

Coming up behind and on my right in the “exit only” offramp (#5) lane is a dude in a fast, hot car. He has apparently cut off into that lane with no intent of exiting, floored it up to about 85 in order to pass a dozen or so cars, then cut back into the #4 lane at the last second before the exit. There’s no place to go in the #4 lane, so he cuts off the guy in back of me to pull in behind me. There’s no place else to go but he can see lots of open road ahead of me, so he honks once and then starts flashing his lights at me.

He’s obviously someone Very Important and he’s driving a Very Hot Car. Who am I to stand in his way? I bow to his Importantness and his car’s Hotness, signal, and move over into the #4 lane. As expected, His Very Important Lead-Footedness floors it and is doing about 90 by the time he gets clear of the campers in the #2 lane.

Oops! I’m sorry. Did he not see the CHP patrol car in the #1 lane on the other side of those campers, “leading” the “parade” of cars doing 55 to 60 in the 55 mph zone? I guess I just assumed that His Very Important Lead-Footedness knew about it and wanted to drive like an idiot anyway.

My bad!


The Los Angeles Times had an article yesterday about how the FCC is proposing to change the rules to make it much easier for telecommunication companies to identify and block robocalls and telemarketers. (For convenience and brevity, “robocallers and telemarketers” will heretofore to be referred to as “LTWS,” as in “Lower Than Whale Shit”.) Not surprisingly, this is the number one complaint that they get from consumers.

The technology exists. If you get your phone using VOIP, there are programs which will detect the program at the originating end as an LTWS tool and simply ignore it. Apparently the FCC rules as they stand now are ambiguous at best and most telecoms believe that they are not allowed to do the same for POTS & conventional landline phones.

The FCC is changing this, so that soon (please, please let it be SOON) PacBell or AT&T or Verizon or whoever will be able to offer a service (I’m sure we’ll pay for it, but it will be worth it in my book) so that LTWS calls simply never ring through to your phone. It might not be quite that simple – you might have to block callers one by one as they come in, or possibly “whitelist” numbers that you will accept calls from. But the bottom line is that the local phone companies will be able to jump into the battle to block LTWS calls.

I’ve speculated before on the best way to deal with LTWS calls. Ignore them? Simply pick it up and then hang up? Take out your frustrations and practice creative cursing on them? See how long you can keep them on the phone to waste their time? Try to derive some entertainment from simply screwing with their heads?

This last offers some great opportunities for creativity. I always think, “WWRWD?” (What would Robin Williams do?) Pretend to not speak English? Make odd, bodily function-ish noises at them? Parrot back everything they say? Ask them to repeat something more slowly because you’re taking notes for your FBI report and you didn’t catch that part? Lead them along while occasionally tooting your vuvuzela at them? (“Tooting your vuvuzela” is not a euphemism, by the way.) Pick any Robin Williams, Jonathan Winters, or Lily Tomlin character and answer their questions in that voice and character? Switch between characters at random? Start asking them pointed questions about their favorite sex toys and alternative uses for them?

The list goes on and on, but yesterday I got a LTWS call right after reading the LA Times article. My brain went into a completely different direction.

“Hello, I’d like to speak to Paul. Is this Paul?”

I respond with a guttural, Neanderthal-like grunt or two.

“Sir, I’d like to talk to you today…”

“The FCC’s coming for you,” I said using my low-pitched, deep “radio voice.” Think Billy Bob Thorton in “Sling Blade.”

“I’m sorry, what?”

“The FCC’s coming for you. You’re all going to jail!” Punctuate deep radio voice with high-pitched, maniacal laugh, then back to radio voice with weird, indeterminate accent. “FCC’s gonna gitcha, boy!” Grunt again a couple of times, then work your way into your best evil villain, mad scientist, “Mwwaaaaahahahaha!!” laugh.

Click.

When I’m paying PacBell $1.50 a month to block the LTWS calls, there might be days when I actually need a call or two like this to respond to, just to cheer me up. Maybe there will be a service that allows you to let LTWS calls through for the next twelve hours, for use in just such a situation.

For an additional $1.50 a month, no doubt.

 

4 Comments

Filed under Distracted Driving, Farce, Freakin' Idiots!, Paul

Flash Fiction: Deluge

This week’s Flash Fiction Challenge is based on a photo. A random photo. A random photo from the Flickr “Interestingness” page.

17581620223_5b067fe97f_oI picked this one showing a desolate ruin in a valley full of dead trees, fog, and a small river. The photo is from Xavier G., entitled “Guerlédan 04,” apparently one of a set of six photos taken at the site of a lake or reservoir which is being drained.

As always, comments and constructive criticisms are appreciated.

DELUGE

The destruction in the valley was complete, the landscaped scoured to bedrock and then rebuilt with debris and mud. Where yesterday there had been fruit trees and shelter from the sun, today there was nothing but the bare trunks and broken branches. Trees that had been young in the youth of my grandfather’s grandfather were snapped like twigs and tossed about like matchsticks.

Small patches of the cobblestone road that led by our house could be seen poking up out of the muck, but there was no sign of the stone bridge that had crossed the river. Sections of the road had been swept away and the stones scattered like seeds downstream.

Given the level of destruction, I was surprised to see anything left of our house. The two primary walls and the fireplace were still somewhat intact, while the two lower walls had been easily breached, allowing the deluge to sweep away everything that we had ever owned.

The only hopeful sign was the sun trying to peak through the low lying fog and clouds. I could barely see the cliffs above the flood’s high water mark as the hills climbed up into the clouds, but in the east there was at least a bright spot in the sky.

I could see no one other than myself. There were a few livestock carcasses on the river banks with crows starting to gather to pick at them. Above, lost in the grey, I could hear the occasional cries of a hawk.

After I had tried to get to the road or the house, only to have my efforts thwarted by the knee-deep, soft, sucking mud, I retreated back to higher ground and collapsed exhausted onto a stump. Catching my breath and trying to find any shred of a plan to move forward, I first heard the sound of the sky ship.

At the time, of course, I had no idea what the sound might be. Our village was small with no formal school. I had learned some letters and numbers from the priest, but I was poorly educated. While there were stories told at night about far off lands and amazing wonders, stories often told by men who had been soldiers but were now simply drunkards, the worlds described were as alien as the lands of the moons.

Turning toward the sound, too spent and hungry to flee, I heard the high-pitched keening grow louder and louder. Around the upstream bend in the canyon I could see a light sweeping across the canyon walls and the ruined flood plain.

As the sound rose and the lights brightened I knew that I should be frightened. The fear that I knew should be there was absent, lost in the long night of thundering, roaring, freezing water. When my family, my friends, and my village vanished screaming into the canyons to the south, leaving me to die alone trapped on the cliffs above, my capacity for fear had been swept away as well.

When one wishes to die, the fear of death does not hold any power over you.

The flying machine appeared around the bend, hovering in the air above the river, higher up than the tallest tree. The beams of light from underneath swept across the ground, searching, finally sweeping over me.

Two of the beams swung back to pin me in their glare. With no place to hide and nothing to keep me here, I chose only to stand and meet my fate on my feet, facing it like the woman that my mother would have wanted me to be if I had been twice as old as I was.

Thus it was that I was found and taken to the city to begin an entirely new life.

2 Comments

Filed under Writing

Reach Out, Touch Space

There are really good odds that there are a couple of opportunities in the next week for you, yes, YOU(!), to personally see spacecraft and/or the opening of a new spaceflight museum!

For pretty much everyone in the Northern Hemisphere, this is an excellent time of year to spot the ISS as it passes overhead. The further north you are, the better the opportunities for multiple sightings in one night.

We’re fairly far south here in LA (34°) so we’ll have the opportunity to see one or two passes some day, generally one after sundown and one before sunrise. For example, Flyby says we have an extremely bright pass on Saturday night at 21:20 (we’ll be at the Hollywood Bowl) and again on 05:26 on Sunday morning. Sunday night there’s a pass at 22:03, then Monday morning a really bright one at 04:33. Monday night at 21:09 will be very bright, Tuesday morning at 3:40 will be so-so. Tuesday night at 20:16 will be very bright… You get the idea.

If you’re further north, you might have as many as four passes a night because of the way the ISS’s orbit is aligned with the Earth’s terminator right now. It happens twice a year (well, twice a year for the Northern Hemisphere, then twice a year for the Southern Hemisphere) during periods referred to as “high beta-angle” periods. The “beta-angle” is the angle between the plane of a satellite’s orbit and the sun. If you don’t want to do the math, the tl;dr version is that  at times of low beta-angle, a satellite gets roughly 50/50 time in sunlight and night, while at high beta-angles it can be in almost continuous sunlight. (If you are interested, there’s a good article here on it.)

With ISS in constant (or near constant) sunlight for several days, if it’s going overhead any time during your night you’ll probably have a chance to see it. Since the ISS will typically be above the horizon four or more times a day for any given location on Earth, that’s a lot of sighting opportunities.

There are many ways to see when the ISS is visible at your location. Primarily I use the Flyby app, but you can also go to the NASA “Spot The Station” site or Heavens Above, both of which are excellent. Just put in your location and they’ll let you know when to go look, where to look to see ISS rising, which direction it will be heading (always generally west-ish to eash-ish), how long the pass will be (typically four to ten minutes), how high it will get in the sky, and how bright it should be.

To the naked eye, ISS will look a bit like an airplane’s bright landing lights, but you won’t see any red or green navigation lights, it won’t blink like an aircraft strobe light, and it will travel in a straight line at a pretty good clip right on across the sky. It will almost always be the brightest thing in the night sky, rivaled only by the moon, Venus, and possibly Jupiter.

How fast is “a good clip”? Well, if it goes right over your head from horizon to horizon, it takes about four and a half minutes to go from the horizon to straight overhead, then another four and a half to get to the opposite horizon. If it’s lower down in the sky, it will be visible for less time. But that should give you an idea of how fast it will be moving.

You don’t have to be in a dark sky location to see ISS. We see it all the time from the heart of Los Angeles with all of the light pollution that involves. If you’re in a dark sky location you’ll see it better, and you’ll have a good chance of seeing several other satellites while you’re waiting for ISS. But no matter where you are, if it’s clear and after dusk, you’ll be able to see it.


 

If you’re on the US East Coast in the mid-Atlantic region this Saturday and looking for something “spacey” to do, I suggest you go to the Grand Opening of the Spaceflight America Museum & Science Center in Prince Frederick, Maryland. That’s on the western shore of Chesapeake Bay, south of the Washington-Baltimore area.

The museum is connected to the Arthur Storer Planetarium, which was renovated in 2014. Both the museum and the planetarium are part of Calvert High School. Arthur Storer was the first astronomer in colonial America and made significant contributions to the field at the time. He was a contemporary and friend of Isaac Newton and made key observations of what would later be known as Halley’s Comet.

One of the folks behind the new Spaceflight America Museum & Science Center is Dan Bramos, a friend I met at the NASA Social in Washington a month ago. Dan and the other volunteers have put a ton of work into getting the museum off the ground and they’ve got big plans for things to come.

If you’re in the region, consider going down to Prince Frederick on Saturday, May 30th, to join in the Grand Opening. (Tell Dan I sent you!) If you can’t make it Saturday but are or will be in the area in the future, check out their hours and go visit then. Follow the museum on Twitter at @Learn2LoveSpace. No matter where you are, you can become a member of the museum to support it ($25/year and up).

Spaceflight America isn’t the Smithsonian, but it’s a terrific local site and organization that’s working in the community to promote scientific, technical, engineering, and mathematical education. I’ll be supporting them and visiting when I can. Please consider doing the same.

1 Comment

Filed under Astronomy, Space

Eustachian Tube Stakes

There are a couple of great ideas rolling around in my head, just waiting to get written out and posted here. (Really, there are!) Unfortunately, there may also be alien larvae or something else equally horrifying in there.

Four weeks ago, when I was in Washington, I started to come down with a cold. As I usually do, I hit it hard with Cold Eeze (zinc lozenges), Dayquil, and Nyquil, and it cleared up in a day or two. Except for my eustachian tubes.

For those not familiar, those are the tubes connecting your ears to your sinuses. When you “pop” your ears with a change in pressure (like going up or down a mountain, or in a plane) it’s to equalize the pressure in those tubes. If you have them really well blocked and fly anyway, it can lead to excruciating pain.

I had them blocked and flew anyway.

Fine, had to get home. Figured that it would clear up along with the cold in a few days. Constantly trying to yawn or wiggle my jaw to clear them was a pain in the ass, but no big deal for a day or so.

Thirty days later…

Let’s skip all of the grisly details and just say that it’s non-fatal, but really, really annoying. And it’s such a stupid little thing! I’ve tried all of the suggested treatments from my hospital’s online site, the Mayo Clinic’s site, WebMD, and FamilyDoctor.org. I’ve taken this, and that, and drunk this, and eaten that.

Nada.

OK, even for such a “stupid little thing,” tomorrow I see the doctor. I want a prescription for a big, long piece of surgical-grade pipe cleaner to put in this ear, pull out the other, then run back and forth like Bugs Bunny or Daffy Duck would to clear it up.

Or better meds than I can get over the counter. Same thing.

Leave a comment

Filed under Health, Paul

Memorial Day 2015

A visit to Washington DC offers many opportunities to think about what Memorial Day is truly about. Our thanks to all of our nation’s military personnel, past and present, who served their country and did what was necessary to keep the wolves at bay.

IMG_5619 small

National World War II Memorial.

IMG_5919 small

Vietnam Veterans Memorial

IMG_5932 small

Vietnam Women’s Memorial

Leave a comment

Filed under Photography, Travel

Boston (Part Six)

It’s finally time to wrap up this visit to Boston, one of my favorite cities. (I’m sure we’ll be back here sooner or later.) So far we have walked The Freedom Trailstarting at Boston Common, seen the Old State House and Faneuil Hall, gone through Paul Revere’s house and the Old North Church, went through the USS Cassin Young in the Charlestown Navy Yard, then showed off the USS Constitution.

IMG_7421 small

Leaving the USS Constitution and the Charlestown Navy Yard, one last thing that caught my eye. While it’s a routine item in Boston, it’s a funny looking oddity to someone who’s lived too long in Southern California. I had to stop and wonder, why does this fire hydrant have an antenna? Are the fire hydrants here all connected to the Internet or linked to the other fire hydrants? Are these really, really high tech fire hydrants in one of our country’s oldest cities?

Obviously not. (I’m goofy and silly, but not that goofy and silly.) It’s just there to warn the snowplow drivers about the hydrant’s presence so that they don’t sheer it off when clearing the the street while the snow’s three or four feet deep. Or, if this corner of the lot hasn’t been cleared at all, it lets the fire department find the hydrant underneath the snow in the event of an emergency. Although that might not have been much use this last winter when they had ten to fifteen to twenty feet or more of snow piled up.

IMG_7578 small

Heading back up the hill and inland from the Charlestown Navy Yard, you’ll remember that we found this statue on the Charlestown Training Ground. I want to know who cleans it – it’s surprisingly clear of “pigeon residue” for a big city statue.

IMG_7517 small

Three blocks up from the Training Ground you’ll find the Bunker Hill Monument. I knew it was there because the maps said it should be, and I had seen it sticking up from a distance when crossing the Charles River. But the townhouses and apartment buildings along those blocks are a couple stories high, the streets are tree-lined, so I remember being surprised to come out from between them and suddenly find a large, open area with the monument.

IMG_7522 small

Colonel William Prescott was one of the leaders of the revolutionary military movement in 1775 Boston. On June 17, 1775, the American revolutionary militia took on a much larger British force in the “Battle of Bunker Hill.” The battle is considered to be the first significant battle in the American Revolution. The British forces, while ultimately able to prevail in three assaults on the militia positions, had over 800 injured and 200 killed from their force of 2,200. The Americans forces suffered 100 killed and more than 300 injured before retreating.

However, the “Battle of Bunker Hill” was not fought on Bunker Hill. Bunker’s Hill is about 600 yards inland. The monument, statues, and the legend have the name, but the battle was actually fought on Breed’s Hill. Prescott had been ordered to put his fortifications on Bunker’s Hill, but had decided that Breed’s Hill was a better defensive position, despite being lower, less steep to climb, and much closer to the British positions. The monument is at the site of the battle, but despite the name, it’s Breed’s Hill, not Bunker’s Hill.

IMG_7528 small

The Bunker Hill Monument is 221 feet tall and was completed in 1843. There’s an obvious comparison to the Washington Monument in Washington, completed in 1884, which at 555 feet is two and a half times taller.

Legend has it that, due to the severe shortage of gunpowder and musket balls that the American troops had, Prescott gave his troops the famous order, “Don’t shoot until you see the whites of their eyes!” While it’s true that the Americans held their fire until the British were quite close (and then shot at the officers first in order to cause chaos), the “whites of their eyes” order was never given. It’s a fiction, created much later to dress up the story.

It’s an impressive monument for an American defeat, especially with all of the incorrect information regarding the battle itself. What is undeniably true about the battle is that it proved to the British that this minor uprising of a few malcontents was going to be much more widespread and difficult. It was going to be a much, much longer battle than they expected, and it was going to cost them far more than they would ever have believed.

IMG_7533 small

Unlike the Washington Monument, where you get up and down by elevator (there are stairs, but they’ve been off-limits for decades), you get to the top of the Bunker Hill Monument by climbing the stairs. Two hundred and ninety-four steps. The stairwell is steep and narrow. You are warned, repeatedly, by park rangers at the bottom, that you really need to make sure you want to make the climb and you’re physically in shape to make the climb. There was a charming young lady there, maybe in her mid to late 20’s, who asked me if I really knew what I was getting into, suggested that I not climb, and then gave me that smug, silent, “Reallllly?” look.

Of course I’m in good enough shape! Maybe I was over fifty and carrying a few pounds that I would like to lose, but had I not just walked the entire Freedom Trail? Am I not a macho, stud muffin of a manly man?

Though. I. Was. Going. To. DIE!

The worst part was the tweens and teens scampering by me like they were floating. Rotten little brats. (The climb really isn’t that bad if you’re in reasonably good shape, but your thighs will be feeling it if you’re not used to hill climbing or using the StairMaster.)

IMG_7553 small

Perseverance will give you some great views back toward Boston. There’s a somewhat cramped observation floor at the top, with windows looking out in all four directions. You can look down on Logan Airport to your east, inland toward Cambridge and Harvard, or north toward the Mystic River area and Malden. Here you can see the downtown area to the south, with the spire of the Old North Church visible on the far left side, just across the Charles River.

IMG_7580 small

Having survived the Bunker Hill Monument (it’s a lot easier climbing down than it is up, and my smug “told you so!” look at the park ranger there wasn’t quite as effective as I wanted since I was sweating like a pig), it was time to head back toward Boston. In theory I could have called a cab – but where’s the fun in that?! I had to get back to meet with The Long-Suffering Wife after she got out of her conference, so I took far fewer pictures on the way back and concentrated on making tracks.

Which, of course, is not to say that I took no pictures on the way back. Just before crossing back over the river into North Boston I found City Square Park, which is a new-ish, one-acre park created early in “The Big Dig.” The Big Dig was a highway project that took over 20+ years and over $22B in an attempt to expand the freeways cutting through the heart of the city by burying them under the existing skyscrapers and houses. (The word “boondoggle” is thrown about quite a bit, and many Bostonians will still start twitching a bit when you mention it.) Directly under City Square Park are some of the freeway tunnels and connecting ramps between US Highway 1 and Interstate 93.

The park is full of all sorts of sculptures, many of fish and other odd creatures. I found them to be extremely fun and whimsical. I also found some quiet and shade and a place to sit for ten minutes. (My thighs were still feeling the whole 294-steps thing.) This fountain and weather vane are in the center of the park.

IMG_7584 small

While there, I also talked to some of the local residents, one of whom was nice enough to take my picture. Of special note are the pasty-white legs, the Angels hat (just to provoke a response), my favorite white-water rafting T-shirt (“The orange vest doesn’t make you safer, just easier to find”), the sacred sunglasses, and the backpack that’s been ’round the world a couple of times carrying my cameras.

Compare this outfit to the slightly more hideous one I displayed while being a tourist in Shanghai. Same hat, glasses, shoes, pasty white, and backpack, but obviously when I want to look like a “classy” tourist I wear a Hawaiian shirt instead of a T-shirt!

Go see Boston, walk the Freedom Trail. Also go to a game at Fenway, see the Boston Pops outside, got to Harvard Square, go down to Quincy to see all of the John Adams sites, go out to Cape Cod. It’s a great city.

 

Leave a comment

Filed under Paul, Photography, Travel

Baseball Tense(ion)

Listening to the Angels game on the radio this afternoon, I heard something that sounded like incorrect grammar, but it took me a while to figure out why it sounded wrong. I’m still not 100% sure that it was wrong.

The phrase in question was something like, “Back in the third inning, Jones pinched hit for Smith.”

OK, “pinched” is the past tense for “pinch,” as in “Now I’m going to pinch you” as opposed to “Yesterday she pinched me.”

At the same time, “hit” is the same for both present and past tense, as in “Come on, hit it!” as opposed to “It was great the way she hit it.”

But in this case, “pinch” in “pinch hit” isn’t a verb, it’s a adverb, a modifier of the verb “hit.” So shouldn’t the past tense of “pinch hit” be “pinch hit”?

A Google search brings up no definitive answer, but does offer some interesting avenues for a wild goose chase off into a classic Web surfing session. A Bing search brings up no definitive answer, but does make you wonder why in hell you bothered to waste time using Bing.

Asking Siri is useless, but entertaining if you waste time trying to figure out if you can ask a question that will get her upset enough to stop talking to you. So far, no joy.

I’m going to go with my gut on this one. “Pinched hit” – nice try, but wrong. “Pinch hit” – gets my vote as correct.

Leave a comment

Filed under LA Angels, Paul, Sports

Thingamabobs – May 22nd

I’ve always found that there are odd little thingamabobs out there in the world. Things that are just a bit “off.” I suspect that most folks would just shrug and move on when encountering these thingamabobs, but I’ve always found them to be worth a second look and further examination.

I like to think my attitude is a result of my retention of a child-like sense of wonder and awe at the amazing universe around us. Others just think that I’m “easily amused.” (They very well might be correct.)

Today’s example is a soda can that spontaneously became an “outie” instead of an “innie.”

IMG_9170

IMG_9171

IMG_9172

IMG_9175

IMG_9176

I know that it happened spontaneously because I was holding the carton it was in when it happened. It was one of those twelve-packs that’s intended to fit into your fridge and dispense one can at a time. I had just gotten home from the grocery store, set the case down on the floor, and felt the case shudder and thump, with a quite audible metallic sound.

I assumed that one of the cans had ruptured and I was going to need to clean up lemonade from all over the kitchen. I hadn’t set the sodas down very hard or on anything sharp, but something had triggered some sort of reaction.

Opening up the case, expecting to find sticky soda spraying everywhere, instead I found all twelve cans to be quite intact and clean. Eleven were perfectly normal, with both ends in the usual concave configuration. This one can had both ends pushed out to be convex.

From an engineering and science background, it made sense that this could have happened. The reason the ends are concave to begin with is because that  shape is very structurally sound to resist and contain the internal pressure from the soda’s gas. This is particularly true on this kind of can which is formed from a single piece of aluminum.

But having the ends concave (“innie”) is only one solution to the structural strength equation. An equally valid solution is to have the two ends convex (“outie”). Think about other large tanks used for containing volumes of liquid or gas under pressure. The Space Shuttle’s external tank. The tanks at the gas station or in your back yard that contain propane. The trucks that haul cold, liquid gases such as nitrogen or oxygen. They’re all shaped like long, narrow tubes with convex ends.

The fact that the huge, industrial strength containers use the convex ends makes me think that it might be because that configuration is stronger than the convex design. I might have to dig out and dust off some math textbooks to test that. (Ed. note: I won’t, don’t worry – I said might.) But the convex shape doesn’t lend itself to containers that can need to stand up on the ground or be stacked.

Think of fire extinguishers, or those big steel containers that contain helium for blowing up party balloons. They’re all flat on the bottom to make them easy stand up, but inside they’re rounded. (Convex or concave? Sounds like a question for “How It’s Made.”)

For soda cans, it’s a huge benefit if they can be stacked and stand up on their own. They also only have to withstand fairly low pressures. The solution there is to make both ends concave. Which is why they’re that way…

…until that rare moment when something snaps on one can and it flips from one stable configuration to one that might be slightly more stable from a pure standpoint, even if it does make it impossible to stand the can on its end.

It’s still amazing to me that it can do that without splitting open the aluminum – but there’s your proof.

(Kevin MacNamara, a high school friend, was the first to point out that I am “easily amused.” See, I still haven’t proven him wrong!)

Leave a comment

Filed under Curiosities, Paul