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Original material is licensed under a Creative Commons License permitting non-commercial sharing with attribution.
11/18/09
Oh, I get it now, it's "art." That's explains why the video demonstrates nothing, and why there is no practical, scientific or culinary value to this. But he did say something about Harvard on his website, so it must be important.
11/18/09
BAM: #RosaRocks #steakfilter
08/30/09
Do you know how much time, money, and effort I spend on printing out my digital photos and sprinkling glitter and sparkle-hearts on them?
This will pay for itself in no time.
08/30/09
08/30/09
If you get stuck, leave a comment and the author will almost always respond and help you out.
08/29/09
The reason you need a wide aperture lens is so that you can still allow a reasonable amount of light in and so that there is enough out of focus area to actually make the effect of the cutout shape visible and obvious. Point and shoots have very short focal lengths and so very little out of focus area, thus, they can't use this trick. It doesn't *have* to be a heart either, it could be a star or triangle or...whatever really.
08/29/09
08/30/09
i don´t see any coment?
08/30/09
The reason you need a wide aperture lens is so that you can still allow a reasonable amount of light in and so that there is enough out of focus area to actually make the effect of the cutout shape visible and obvious. Point and shoots have very short focal lengths and so very little out of focus area, thus, they can't use this trick. It doesn't *have* to be a heart either, it could be a star or triangle or...whatever really"
By "bikehorn86"
08/29/09
08/29/09
08/29/09
08/29/09
[www.diyphotography.net]
07/23/09
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07/30/09
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07/23/09
I do remember a TV show (NOVA, maybe?) from many, many years ago where they had someone rebreathing his own, unscrubbed air. He was copying sentances from a book for about 20 minutes or so before his handwriting really declined and he nearly passed out.
07/23/09
07/23/09
That said, the danger of this situation seems to be overstated. I'm pretty sure that Cassidy was not in any danger of being exposed to LiOH. This substance is used in SCUBA rebreathers and is well contained in that application. LiOH is corrosive but the Li polymers found in your laptop are explosive and you have that thing on your lap! You must have balls of asbestos.
The device that broke was probably very similar to a SCUBA rebreather and thus this scenario was more akin to a scuba diver noticing his rebreather wasn't scrubbing CO2 well, resulting in shorter bottom time. Surely no fun but SCUBA rebreathers have small reserve tanks of O2, I'd bet NASA had a small contingency cylinder for just this type of malfunction.
07/23/09
07/23/09
At high concentrations, CO2 dissolves into the blood as carbonic acid and causes the blood to become acidic. The process is very slow however and probably not an issue here.
The place where carbonic acid is an issue is the ocean. Increased CO2 levels have acidified the ocean, leading to bleaching. I read the Barrier Reef has about 20 years left. The astronaut will be fine, the ocean is the one we should be worried about here.
07/23/09
One test pilot nearly did while being escorted by Chuck Yeager while on a test run. Chuck noticed that the pilot was slurring his words and getting paunchy. Chuck tried to convince him of the problem, but the pilot said "shut up, I'm running this show." Chuck finally faked an emergency to con the pilot to follow him below 10,000 feet and the pilot perked back up. They got him back on the ground without further incident.
A malfunctioning closed circuit system, especially with the LiOH canister, is grounds for an immediate abort, switchover to the "bailout" bottle, and to get to safety. That comment by the astronaut makes me think back to that Navy test pilot that Yeager bailed out of trouble. It could have gotten worse if they didn't shoo him back inside the station.
CO2 poisoning is a subtle affair and someone not knowing that their CO2 levels are exceeding saturation until it's too late is all too common.
And yes, the PLSS they use has two oxygen bottles to feed them supplemental O2 and to use as a backup.
07/23/09
Anyway, it's cool to know that the people in Houston are continuously monitoring all spacesuit sensors. I guess I always assumed it was the other astronauts within the ISS that would be doing this (especially considering the delay which although short, may be crucial in an event like this).
07/23/09
07/23/09
Actually, this sentence indicates that the "lithium hydroxide CO2 scrubber" is the lethal gas.
07/23/09
It might read a bit weird but it was just CO2.
07/23/09