askscience

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How do animals "know" the warning signs of venomous creatures, such as a black widow's red hourglass or a rattlesnake's rattle? Is it purely instinct, or is there some transmission of information, the way migratory birds "learn" a migration route from those who've flown it before?	1
Why does not completely using up a prescribed antibiotic contribute to development of an antibiotic-resistant strain? Wouldn't the resistant bacteria survive no matter how much of the antibiotic was used anyway?	1
Did the DNA molecule evolve as a way of storing RNA?	1
Is the sick, miserable feeling of, say, having the flu partly because our body stops producing endorphins, so that we will feel horrible and get rest?	1
Do astronauts in orbit float because Earth's gravitational pull there is so weak, or because by orbiting they are continuously "falling"?	1
If you added up all the bacteria, viruses, and spores killed by the average person's immune system over a lifetime, how much volume would they take up?	1
How much of the increase in cancer rates is attributable to people simply surviving other diseases and accidents, etc., to live longer -- long enough to get cancer?	1
How did the avian dinosaurs survive the disaster that wiped out all the other dinosaurs?	1
What evolutionary factors make a region have a lot of venomous snakes compared to other areas with many snakes? (I'm looking at you, Australia.) What makes for snakes with incredibly deadly (to us) venom as opposed to, say, a rattlesnake-venom level of toxicity?	1
If we humans were more intelligent as a species, how would we be smarter? What specific cerebral tasks would, say, work faster or avail themselves of more data? Would that necessarily result in a more cerebral species, that is, greater reliance on intelligent deduction than on emotion or instinct?	1

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