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

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How are exact standards of human health (20/20 vision, 98.6°F body temp, etc) determined if everyone's body is a little different?

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What's the oldest animal we have ever found evidence of existing?

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Do we actually understand why magnets work? Not just how they influence other things, but where the force actually comes from.

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Why do dehydration headaches hurt in the very front of the brain? Does this area use more water?

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Is the universe a sphere?

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Two potentially dumb questions about human emotions and neurotransmitters.

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Why are menstrual cramps so painful? Wouldn't this be an evolutionary hindrance?

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What would happen to two particles traveling at 50% c that collided head on? Would this be the same as a single particle traveling at c hitting an immobile object?

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Is it possible that there could be "galaxies" made of antimatter somewhere in the universe?

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If we started the moon spinning again, would it change anything on Earth?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How are exact standards of human health (20/20 vision, 98.6°F body temp, etc) determined if everyone's body is a little different?	1
What's the oldest animal we have ever found evidence of existing?	1
Do we actually understand why magnets work? Not just how they influence other things, but where the force actually comes from.	1
Why do dehydration headaches hurt in the very front of the brain? Does this area use more water?	1
Is the universe a sphere?	1
Two potentially dumb questions about human emotions and neurotransmitters.	1
Why are menstrual cramps so painful? Wouldn't this be an evolutionary hindrance?	1
What would happen to two particles traveling at 50% c that collided head on? Would this be the same as a single particle traveling at c hitting an immobile object?	1
Is it possible that there could be "galaxies" made of antimatter somewhere in the universe?	1
If we started the moon spinning again, would it change anything on Earth?	1