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

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How does the hair "know" to stop getting longer on our arms and eyebrows/eyelashes, but just keeps getting longer on top of the head?

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Although nothing can travel faster than the speed of light, if you shined one flashlight directly east and the other directly west, would the light photons traveling east appear to be going faster than the light photons going west, or vice versa?

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Has there been any molecular or genetic evidence to show homosexuality is natural?

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Why are so many people afraid of spiders? Is it an evolutionary trait that has been selected?

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If you could insert any gene or mutation into the human genome, what it be?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How does the hair "know" to stop getting longer on our arms and eyebrows/eyelashes, but just keeps getting longer on top of the head?	1
Although nothing can travel faster than the speed of light, if you shined one flashlight directly east and the other directly west, would the light photons traveling east appear to be going faster than the light photons going west, or vice versa?	1
Has there been any molecular or genetic evidence to show homosexuality is natural?	0
Why are so many people afraid of spiders? Is it an evolutionary trait that has been selected?	0
If you could insert any gene or mutation into the human genome, what it be?	0