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

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Why do oscillating lawn sprinklers go "th. th. th. th. th. th. thththththththththththth th. th. th. th...."?

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I've only been kicked in the nuts once, when I was about ten. I remember feeling pain, nausea, headache, ringing in the ears, aching joints, and more. I can't even imagine it happening now. Why does this injury cause such stress to the body?

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I understand why we sing and play music (sexual ornamentation and all that), but why do other people enjoy it? What is it about music that makes pretty much every human in the universe react to it?

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Why do women cover their mouths when they're shocked, but men don't?

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What is it about eye contact that influences human (and other primate) relationships so much?

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How did we get to where we are in terms of nations, borders, armies, war, and the like? I understand that territoriality plus technology is a big part of it. But I'm hoping someone can fill in the details. What are some of the major milestones in this evolution?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why do oscillating lawn sprinklers go "th. th. th. th. th. th. thththththththththththth th. th. th. th...."?	1
I've only been kicked in the nuts once, when I was about ten. I remember feeling pain, nausea, headache, ringing in the ears, aching joints, and more. I can't even imagine it happening now. Why does this injury cause such stress to the body?	1
I understand why we sing and play music (sexual ornamentation and all that), but why do other people enjoy it? What is it about music that makes pretty much every human in the universe react to it?	1
Why do women cover their mouths when they're shocked, but men don't?	1
What is it about eye contact that influences human (and other primate) relationships so much?	1
How did we get to where we are in terms of nations, borders, armies, war, and the like? I understand that territoriality plus technology is a big part of it. But I'm hoping someone can fill in the details. What are some of the major milestones in this evolution?	0