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

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How can a tiny doorbell speaker make such a loud noise, yet a headphone speaker that is slightly larger cannot?

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Why don't standard transmission cars have a simple "up-down" shifter like on motorcycles, rather than the shifter with "slots" for each gear?

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Do animals that care for their young before separating recognize them in future encounters? What happens if the young doesn't want to separate?

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How many times would one need to use a stainless steel straw to offset the additional resources required to make it rather than a plastic straw?

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Assuming no friction would I theoretically be able to feel the difference between a pulley-reduced cable machine and a direct-cable machine?

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How strong would someone have to be to jump from a tower with a bungee cord while holding on to the cord?

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I don't eat very many dark brown things. Why is my poop always brown?

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Why is a propane range OK to use indoors but not a propane camp stove like a coleman stove?

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It's a well known "fact" that women experience a dramatic increase in the sensitivity of their smell when pregnant. Is this true? If so how does it work? Do they get more sensory receptors? Does the brain give it a higher priority? Why does it happen?

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When trying to cool a room, is it better to have a fan blowing hot air out the window, or blowing cool air in?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How can a tiny doorbell speaker make such a loud noise, yet a headphone speaker that is slightly larger cannot?	1
Why don't standard transmission cars have a simple "up-down" shifter like on motorcycles, rather than the shifter with "slots" for each gear?	1
Do animals that care for their young before separating recognize them in future encounters? What happens if the young doesn't want to separate?	1
How many times would one need to use a stainless steel straw to offset the additional resources required to make it rather than a plastic straw?	1
Assuming no friction would I theoretically be able to feel the difference between a pulley-reduced cable machine and a direct-cable machine?	1
How strong would someone have to be to jump from a tower with a bungee cord while holding on to the cord?	1
I don't eat very many dark brown things. Why is my poop always brown?	1
Why is a propane range OK to use indoors but not a propane camp stove like a coleman stove?	1
It's a well known "fact" that women experience a dramatic increase in the sensitivity of their smell when pregnant. Is this true? If so how does it work? Do they get more sensory receptors? Does the brain give it a higher priority? Why does it happen?	1
When trying to cool a room, is it better to have a fan blowing hot air out the window, or blowing cool air in?	1