/u/Kantor48's posts in /r/askscience

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Since wasted energy in a circuit typically ends up as heat, are electric heaters nearly 100% efficient?

1713 upvotes

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Why is there so little variation in hair colour amongst non-white people?

673 upvotes

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What directly triggers sleep? Why can't we do it consciously?

13 upvotes

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How long would it take, in SUBJECTIVE time, travelling at just below the speed of light (say, 299,000 km/s) to reach Alpha Centauri?

11 upvotes

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If light has more energy than microwaves (since it has a higher frequency), why do microwaves have a greater heating effect?

9 upvotes

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If you're travelling through a non-vacuum (e.g. water), is your maximum speed that of light in a vacuum, or in the medium?

7 upvotes

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Does Dark Energy violate the conservation of energy?

3 upvotes

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If coughing gets food or phlegm out of the airways, why does drinking water help?

1 upvotes

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How has nervousness survived natural selection?

1 upvotes

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How does a mirror know which way is sideways?

0 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Since wasted energy in a circuit typically ends up as heat, are electric heaters nearly 100% efficient?	1713
Why is there so little variation in hair colour amongst non-white people?	673
What directly triggers sleep? Why can't we do it consciously?	13
How long would it take, in SUBJECTIVE time, travelling at just below the speed of light (say, 299,000 km/s) to reach Alpha Centauri?	11
If light has more energy than microwaves (since it has a higher frequency), why do microwaves have a greater heating effect?	9
If you're travelling through a non-vacuum (e.g. water), is your maximum speed that of light in a vacuum, or in the medium?	7
Does Dark Energy violate the conservation of energy?	3
If coughing gets food or phlegm out of the airways, why does drinking water help?	1
How has nervousness survived natural selection?	1
How does a mirror know which way is sideways?	0