/u/GPL89's posts in /r/askscience

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If we could travel at 99.9% the speed of light, it would take 4 years to get to Alpha Centauri. Would the people on the spaceship feel like they were stuck on board for 4 years or would it feel shorter for them?

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Are we born with completely random singing voices?

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Why do humans shiver/shudder when we are creeped out? What is the biological response intended to do? Was it learned or did our ancestors do it too?

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Usain Bolt runs the 100m under 10 seconds continuously, why can't he run the 400m under 40 seconds?

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Does a star's luminosity equate to 'heat' output?

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Looking back through millions of years in history, we have been able to identify the evolutionary traits of animals and humans. Is there a way to predict what humans, and other animals, will evolve into in the distant future or are we the final stop on our evolutionary time line?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If we could travel at 99.9% the speed of light, it would take 4 years to get to Alpha Centauri. Would the people on the spaceship feel like they were stuck on board for 4 years or would it feel shorter for them?	33971
Are we born with completely random singing voices?	1
Why do humans shiver/shudder when we are creeped out? What is the biological response intended to do? Was it learned or did our ancestors do it too?	1
Usain Bolt runs the 100m under 10 seconds continuously, why can't he run the 400m under 40 seconds?	1
Does a star's luminosity equate to 'heat' output?	1
Looking back through millions of years in history, we have been able to identify the evolutionary traits of animals and humans. Is there a way to predict what humans, and other animals, will evolve into in the distant future or are we the final stop on our evolutionary time line?	1