/u/[deleted]'s posts in /r/askscience
Why is it hotter the closer you get to the sun, even though there is no medium to transfer the heat? Does the radiation somehow cool down the further it travels?
2212 upvotes
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What causes us to transition from conscious to unconscious, in the context of falling to sleep? For example, right now I am feeling really tired, I'm yawning like crazy, but when I close my eyes, nothing happens.
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I keep hearing over and over that the big bang originated from a point the size of a pea, or a pin head, or some other tiny object. This was repeated again in the first episode of COSMOS. How do we know this?
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My eyes can focus on an object that is roughly as small as 1/20,000th my body length. Can a small insect's eyes do the same? Could an insect see bacteria?
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Did cocoa trees, coffee plants, and tea plants all evolve the production of caffeine independently, or do they share a common ancestor that made caffeine?
2148 upvotes
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