5 ms·
We don't even know that he got lucky. Lasers didn't exist yet to force us to study retinal exposure to bright non-UV light and the flash from the bomb didn't l
by StrictDabbler 8y ago
We don't even know that he got lucky.
Lasers didn't exist yet to force us to study retinal exposure to bright non-UV light and the flash from the bomb didn't last that long, nor were the first few bombs that bright, so he may have been fine... but obviously if you stare at the sun through three inches of glass you're still going to burn your retinas.
He says "I figured the only thing that could really hurt your eyes (bright light can never hurt your eyes) is ultraviolet light. I got behind a truck windshield, because the ultraviolet can’t go through glass, so that would be safe, and so I could see the damn thing."
What we know from later laser research is that unless you have a comprehensive visual field test, it's often hard to identify that part of your retina has been scorched. Your brain just filters it out as a blind-spot and you don't realize what you're failing to see.
There's every chance that Feynman totally burned a section of his retina and never realized it, and there's every chance that he was fine because the exposure at his distance wasn't that bad, but at the end of the day he was more reckless than insightful in this situation.
- kragen 8y agoMaybe he should have closed one eye, but the first atomic bomb only explodes once. Your body won't last forever no matter how well you care for it (as Feynman well knew, having just watched his wife Arline die slowly of incurable tuberculosis); seeing the first atomic-bomb test with your own eyes seems eminently worth the risk of blindness, or even sacrificing an eye.
- abdulhaq 8y agoI really can't agree. I would not exchange my eyesight for the whole world, literally. Therefore the qudos of having looked at a novel explosion in no way compensates for any risk to my eyes.
- kragen 8y agoYou are guaranteed to lose your eyesight, no matter what you do. Nobody has eyesight after they die, and like all human bodies born before the 19th century have already done, your body is going to die within the next few decades, barring great medical breakthroughs. The most you can do for your eyesight is to delay its inevitable loss. (Wow, awareness of mortality sure is unpopular on HN! To all humans downvoting this: you, too, are going to die, because that is what happens to humans.)
- bryanrasmussen 8y agoI thought the next few decaces was a climate change reference.
- kragen 8y agoSorry, no, I just meant that the maximum human lifespan recorded so far is 12.2 decades, and the vast majority of people reading this will die in even less, 2–5 decades, regardless of what happens with climate change. Given that, it's silly to treat your body as if you could make it last forever. I've edited my comment above to clarify.
- abdulhaq 8y agoEven if I knew was going to die tomorrow, I will not exchange my remaining eyesight for qudos. I would prefer to spend my last day looking at my family, the trees, the running water, the flowers. It seems totally uncontroversial to me, I'm really surprised to find someone who disagrees.
- muraiki 8y agoDownvoted not because I’m afraid of my own mortality, but because pointing out the obvious fact that nobody can see after they die is neither insightful nor useful. Go tell that to someone who has become blind and let me know how much consolation that provides them.
- blotter_paper 8y ago>I would not exchange my eyesight for the whole world, literally. FYI vacuum exposure can cause blindness, visual impairment, and death.
- Florin_Andrei 8y ago> bright light can never hurt your eyes Before y'all criticize that statement, keep in mind it's coming from one of the best scientists of the 20th century. He was talking before lasers. For a purely thermal source to hurt the eyes, it would have to be: 1. insanely hot 2. quite close to the observer First condition is met by the nuke, but the second one, obviously, is not, unless you're a victim of the explosion.
- ISL 8y agoScientists, even the best ones, do dumb things all the time. Source: Am experimental physicist; do dumb things. Sometimes my colleagues do too, even the best ones.
- justin66 8y agoLos Alamos was replete with brilliant people doing dangerously stupid things. https://en.wikipedia.org/wiki/Demon_core https://en.wikipedia.org/wiki/Demon_core
- Florin_Andrei 8y agoI know. It was not meant as an absolute statement.
- hinkley 8y agoAre we sure he wasn’t wearing sunglasses too?
- failrate 8y agoI have a scar on my retina near the fovea, and I can only see it if I deliberately focus on it.
- astrodust 8y agoAs much as a window blocks UV, I wouldn't trust a laser if a high-powered UV laser was aimed through it at my eye.