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

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Does lightning occur on Mars? If so, what is the effect of such a high-temperature phenomenon in such a cold environment?

128 upvotes

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If my speed is relative, not absolute, and the speed of light always appears the same no matter my reference frame, how is a statement like "I am travelling at 99% of the speed of light" meaningful?

57 upvotes

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Is there a difference between the individual cells of human children and adults?

11 upvotes

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As far as we can tell, does walking straight up a tree trunk feel the same for an ant as walking along flat ground?

1 upvotes

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If glacial ice largely melts, is there any chance other forms of water retention could pick up some of the slack and mitigate sea-level rise?

1 upvotes

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What happens to a light wave when it propagates from an area where the electromagnetic filed is weak (e.g. deep space) to one where it is relatively strong (e.g. near the earth)? Does this have an effect on wavelength or amplitude?

1 upvotes

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Pouring boiling water into a cup seems to make a different sound than pouring cold water into the same cup. Why is this the case?

1 upvotes

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Why do we get hiccups, and is there any way to get rid of them?

0 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Does lightning occur on Mars? If so, what is the effect of such a high-temperature phenomenon in such a cold environment?	128
If my speed is relative, not absolute, and the speed of light always appears the same no matter my reference frame, how is a statement like "I am travelling at 99% of the speed of light" meaningful?	57
Is there a difference between the individual cells of human children and adults?	11
As far as we can tell, does walking straight up a tree trunk feel the same for an ant as walking along flat ground?	1
If glacial ice largely melts, is there any chance other forms of water retention could pick up some of the slack and mitigate sea-level rise?	1
What happens to a light wave when it propagates from an area where the electromagnetic filed is weak (e.g. deep space) to one where it is relatively strong (e.g. near the earth)? Does this have an effect on wavelength or amplitude?	1
Pouring boiling water into a cup seems to make a different sound than pouring cold water into the same cup. Why is this the case?	1
Why do we get hiccups, and is there any way to get rid of them?	0