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

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If something has no rest mass does that mean it must be travelling at the speed of light?

1659 upvotes

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What exactly is spin in quantum mechanics?

48 upvotes

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If golf balls have dimples on them to make them more aerodynamic then why don't cars or planes have them too?

34 upvotes

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Are there limits (low or high) to the frequencies that lasers can emit?

9 upvotes

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Is the half-life of radioactive elements calculated theoretically or is it just measured?

9 upvotes

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If there seems to be poisonous gas in the air, should I take shallow breaths? Hold my breath? What do I do as I try to reach safety?

1 upvotes

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Where does the heat come from in warm-blooded animals?

1 upvotes

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Are humans biologically meant to wash themselves?

1 upvotes

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If time dilation causes time to "slow" the closer you are to a source of gravity, and if time stops inside a black hole, then is everything accumulated at the event horizon?

1 upvotes

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Could you electrically/mechanically manipulate the vocal cords of an animal and artificially make it talk?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If something has no rest mass does that mean it must be travelling at the speed of light?	1659
What exactly is spin in quantum mechanics?	48
If golf balls have dimples on them to make them more aerodynamic then why don't cars or planes have them too?	34
Are there limits (low or high) to the frequencies that lasers can emit?	9
Is the half-life of radioactive elements calculated theoretically or is it just measured?	9
If there seems to be poisonous gas in the air, should I take shallow breaths? Hold my breath? What do I do as I try to reach safety?	1
Where does the heat come from in warm-blooded animals?	1
Are humans biologically meant to wash themselves?	1
If time dilation causes time to "slow" the closer you are to a source of gravity, and if time stops inside a black hole, then is everything accumulated at the event horizon?	1
Could you electrically/mechanically manipulate the vocal cords of an animal and artificially make it talk?	1