/u/graaahh's posts in /r/askscience

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Does the heat of a concentrated spot of sun increase exponentially with the size of the magnifying glass used to focus it? Does magnifying power make a difference?

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Before the days of orbiting telescopes, how did astronomers use spectral lines to determine chemical composition of stars, without the results being affected by the Earth's atmosphere?

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Is there always a test that can be done to check if a number is divisible by a given prime?

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How is it that if I jump from a third story ledge, I'll likely severely injure myself, but if I jump off with high forward momentum (say, on skates) I could be just fine?

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What would happen if a large meteor or comet flew within 10 feet of the surface of the earth without directly striking it?

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I have heard that if our brain were not limiting the strength of our muscles to protect our bodies, we would be capable of amazing feats (such as lifting thousands of pounds). Is there any truth to this, and if so, how can we even know such a thing?

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If red wavelengths of light are super long, and purple wavelengths are super short, how do they blend into each other? What is the wavelength right in the middle like?

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Could people with anterograde amnesia improve their ability to form memories by tying new information to existing "old" memories?

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Posible dumb question... why is it deoxyribonucleic acid? What's acidic about it?

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Why do humans have a much higher incidence of mental illness than other animals?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Does the heat of a concentrated spot of sun increase exponentially with the size of the magnifying glass used to focus it? Does magnifying power make a difference?	2
Before the days of orbiting telescopes, how did astronomers use spectral lines to determine chemical composition of stars, without the results being affected by the Earth's atmosphere?	2
Is there always a test that can be done to check if a number is divisible by a given prime?	2
How is it that if I jump from a third story ledge, I'll likely severely injure myself, but if I jump off with high forward momentum (say, on skates) I could be just fine?	1
What would happen if a large meteor or comet flew within 10 feet of the surface of the earth without directly striking it?	1
I have heard that if our brain were not limiting the strength of our muscles to protect our bodies, we would be capable of amazing feats (such as lifting thousands of pounds). Is there any truth to this, and if so, how can we even know such a thing?	1
If red wavelengths of light are super long, and purple wavelengths are super short, how do they blend into each other? What is the wavelength right in the middle like?	1
Could people with anterograde amnesia improve their ability to form memories by tying new information to existing "old" memories?	1
Posible dumb question... why is it deoxyribonucleic acid? What's acidic about it?	1
Why do humans have a much higher incidence of mental illness than other animals?	1