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

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Why is there a history gap between Africa's civilizations?

508 upvotes

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In searching for Earth-like exoplanets, what is considered the acceptable limits of the planet's characteristics for human habitation i.e. Earth's surface gravity +/-10%, temperature range, atmospheric pressure/composition, orbital radius, etc.?

185 upvotes

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In industrial-scale recycling, how much non-recyclable material can be present in a batch of recyclable material before it becomes too difficult/inefficient to be viable?

44 upvotes

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Is there a way to insulate/shield against an electromagnetic field the way lead and other dense material can shield against radiation?

13 upvotes

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Is there anywhere other than Earth in the Solar system where you could see a total solar eclipse and/or total lunar eclipse equivalent?

11 upvotes

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Does relativity have any effect on temperature similar to how length becomes contracted and time gets dilated?

8 upvotes

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Is there any possible sun-planet-moon configuration that would yield a full moon every night?

6 upvotes

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How did the leftover energy of the Big Bang "condense" into the first protons, neutrons, electrons, and other sub-atomic particles? Was it some form of reverse matter-antimatter annihilation?

5 upvotes

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During a heart transplant, how do the surgeons not kill the patient while the original heart is being removed?

4 upvotes

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How exactly does cancer kill?

2 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Why is there a history gap between Africa's civilizations?	508
In searching for Earth-like exoplanets, what is considered the acceptable limits of the planet's characteristics for human habitation i.e. Earth's surface gravity +/-10%, temperature range, atmospheric pressure/composition, orbital radius, etc.?	185
In industrial-scale recycling, how much non-recyclable material can be present in a batch of recyclable material before it becomes too difficult/inefficient to be viable?	44
Is there a way to insulate/shield against an electromagnetic field the way lead and other dense material can shield against radiation?	13
Is there anywhere other than Earth in the Solar system where you could see a total solar eclipse and/or total lunar eclipse equivalent?	11
Does relativity have any effect on temperature similar to how length becomes contracted and time gets dilated?	8
Is there any possible sun-planet-moon configuration that would yield a full moon every night?	6
How did the leftover energy of the Big Bang "condense" into the first protons, neutrons, electrons, and other sub-atomic particles? Was it some form of reverse matter-antimatter annihilation?	5
During a heart transplant, how do the surgeons not kill the patient while the original heart is being removed?	4
How exactly does cancer kill?	2