/u/o99o99's posts in /r/askscience

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If humans were to travel in deep space, how would we keep our bearings without a magnetic field for a compass or gravity for a gyroscopic motion sensor?

110 upvotes

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How does the wavelength of EM radiation affect its ability to pass through a slit? How is wavelength relevant to the "amplitude" of a wave of light?

4 upvotes

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What are the possible effects of drinking 300ml of vodka in one go, as a 14 year-old male with a body mass of around 50/60kg?

1 upvotes

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What is the "speed" of gravity?

1 upvotes

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Theoretically, could a human survive re-entry with a pressure suit and a parachute, and what would be the maximum speed they could travel at without burning up?

1 upvotes

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In most species, the male individual will perform some kind of mating dance and show off to the female during courtship. In how many species is this reversed, or shared, like in humans?

1 upvotes

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Does a tidal river's stream move at a different speed an hour after high tide compared to an hour before low tide?

1 upvotes

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How many molecules of an odour are needed before we can smell it?

1 upvotes

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Why do dark-skinned people from hotter countries never have light hair, which would reflect sunlight more effectively?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
If humans were to travel in deep space, how would we keep our bearings without a magnetic field for a compass or gravity for a gyroscopic motion sensor?	110
How does the wavelength of EM radiation affect its ability to pass through a slit? How is wavelength relevant to the "amplitude" of a wave of light?	4
What are the possible effects of drinking 300ml of vodka in one go, as a 14 year-old male with a body mass of around 50/60kg?	1
What is the "speed" of gravity?	1
Theoretically, could a human survive re-entry with a pressure suit and a parachute, and what would be the maximum speed they could travel at without burning up?	1
In most species, the male individual will perform some kind of mating dance and show off to the female during courtship. In how many species is this reversed, or shared, like in humans?	1
Does a tidal river's stream move at a different speed an hour after high tide compared to an hour before low tide?	1
How many molecules of an odour are needed before we can smell it?	1
Why do dark-skinned people from hotter countries never have light hair, which would reflect sunlight more effectively?	1