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

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How long could a human live off of just breast milk (assuming an inexhaustible supply)?

217 upvotes

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Why is bird poop white?

77 upvotes

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What is the science behind water fluoridation?

9 upvotes

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Can animals differentiate between genders in other species?

4 upvotes

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If a group of metallurgists found themselves lost in the Rocky Mountains, without access to modern-day metallurgical technology, could they mine ore, smelt it, and forge/cast metal tools, and if so, how would they do it?

1 upvotes

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If a group of metallurgists found themselves lost in the Rocky Mountains, cut-off from civilization, and with no access to modern-day technology, would they still be able to mine ore and forge/cast metal tools, and if so, how would they do it?

1 upvotes

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Do all helium balloons eventually allow helium to escape? And if so, what is the record for the longest a helium balloon has retained lighter-than-air buoyancy?

1 upvotes

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Could a spacecraft circling the earth at orbital velocity feasibly slow its speed enough, e.g. via reverse thrust rockets, such that it would not burn up during reentry into the atmosphere?

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If we could jump 65 million light years ahead of the light emanating from Earth, how big of a telescope would we need to observe the impact event that killed the dinosaurs? How big would it need to be to observe dinosaurs on Earth's surface?

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Why are there so few tropical cyclones/hurricanes in the South Atlantic?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
How long could a human live off of just breast milk (assuming an inexhaustible supply)?	217
Why is bird poop white?	77
What is the science behind water fluoridation?	9
Can animals differentiate between genders in other species?	4
If a group of metallurgists found themselves lost in the Rocky Mountains, without access to modern-day metallurgical technology, could they mine ore, smelt it, and forge/cast metal tools, and if so, how would they do it?	1
If a group of metallurgists found themselves lost in the Rocky Mountains, cut-off from civilization, and with no access to modern-day technology, would they still be able to mine ore and forge/cast metal tools, and if so, how would they do it?	1
Do all helium balloons eventually allow helium to escape? And if so, what is the record for the longest a helium balloon has retained lighter-than-air buoyancy?	1
Could a spacecraft circling the earth at orbital velocity feasibly slow its speed enough, e.g. via reverse thrust rockets, such that it would not burn up during reentry into the atmosphere?	1
If we could jump 65 million light years ahead of the light emanating from Earth, how big of a telescope would we need to observe the impact event that killed the dinosaurs? How big would it need to be to observe dinosaurs on Earth's surface?	1
Why are there so few tropical cyclones/hurricanes in the South Atlantic?	1