/u/[deleted]'s posts in /r/askscience

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The vast majority of the 150-400 billion stars in the Milky Way haven't been directly detected. Alpha Centauri is the nearest known star to Sol. What is the probability that there are nearer stars that remain undiscovered?

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If diseases brought over from Europe managed to wipe out so many Native Americans, why didn't any American diseases wipe out the European explorers?

341 upvotes

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How can cats and dogs drink dirty water and eat poo (usually) without getting seriously ill? And how come humans can't?

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Can the brain hold infinite information, or does it have a finite capacity once reached max you will have to start "forgetting/deleting" some of those information?

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I keep hearing that Voyager will take 10,000 years or 100,000 years to reach the closest star. Is it actually aimed towards a star or is it just going in a random direction?

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Do I still get Vitamin D benefits from being outside on a cloudy day?

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Post exposure rabies shots protection?

338 upvotes

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Do sound waves in the air interfere with each other?

336 upvotes

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Could any former planets of our solar system have crashed into the sun?

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Do doctors and nurses develop stronger immune systems from spending most of their time working in hospitals? Or do they become sick more often than the general population? Are there any other effects on ones health from working in a hospital setting long term?

334 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
The vast majority of the 150-400 billion stars in the Milky Way haven't been directly detected. Alpha Centauri is the nearest known star to Sol. What is the probability that there are nearer stars that remain undiscovered?	343
If diseases brought over from Europe managed to wipe out so many Native Americans, why didn't any American diseases wipe out the European explorers?	341
How can cats and dogs drink dirty water and eat poo (usually) without getting seriously ill? And how come humans can't?	341
Can the brain hold infinite information, or does it have a finite capacity once reached max you will have to start "forgetting/deleting" some of those information?	340
I keep hearing that Voyager will take 10,000 years or 100,000 years to reach the closest star. Is it actually aimed towards a star or is it just going in a random direction?	340
Do I still get Vitamin D benefits from being outside on a cloudy day?	339
Post exposure rabies shots protection?	338
Do sound waves in the air interfere with each other?	336
Could any former planets of our solar system have crashed into the sun?	336
Do doctors and nurses develop stronger immune systems from spending most of their time working in hospitals? Or do they become sick more often than the general population? Are there any other effects on ones health from working in a hospital setting long term?	334