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

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Is there any legitimate reason to get a new toothbrush when the old toothbrush still appears to be performing perfectly?

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How do pets get fleas from going outside? Are the fleas just hanging around waiting for a host to come by, or is it from the pet's interaction with other hosts?

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You hear about many species that only lay their eggs where they themselves hatched (salmon, sea turtles, etc.). How do these species spread to colonize more places?

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When you feel nauseous and feel like you need to burp or vomit but can't seem to, what's happening physiologically?

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What is the limitation that causes radios such as those found in cell phones to be limited to specific frequencies?

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How did cavemen maintain their fingernails? Are there any other animals with nails similar to humans that maintain them somehow?

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For endangered animals, I often hear there is a minimum viable population of genetic diversity and once a population drops below that, extinction is likely. Why is it that parasites like fleas and bedbugs and worms seem perfectly able to thrive from a single initial infection?

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Would it be possible for a society to live entirely underground like in sci-fi or fantasy?

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How much of the benefit of washing hands is neutralized or even outweighed by handling potentially unclean objects like a door handle or faucet knob?

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Does washing my hands still significantly help in removing germs if afterwards I use my phone that I never wash, or put my hands in my pockets, or touch the bathroom doorknob?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Is there any legitimate reason to get a new toothbrush when the old toothbrush still appears to be performing perfectly?	1
How do pets get fleas from going outside? Are the fleas just hanging around waiting for a host to come by, or is it from the pet's interaction with other hosts?	1
You hear about many species that only lay their eggs where they themselves hatched (salmon, sea turtles, etc.). How do these species spread to colonize more places?	1
When you feel nauseous and feel like you need to burp or vomit but can't seem to, what's happening physiologically?	1
What is the limitation that causes radios such as those found in cell phones to be limited to specific frequencies?	1
How did cavemen maintain their fingernails? Are there any other animals with nails similar to humans that maintain them somehow?	1
For endangered animals, I often hear there is a minimum viable population of genetic diversity and once a population drops below that, extinction is likely. Why is it that parasites like fleas and bedbugs and worms seem perfectly able to thrive from a single initial infection?	1
Would it be possible for a society to live entirely underground like in sci-fi or fantasy?	1
How much of the benefit of washing hands is neutralized or even outweighed by handling potentially unclean objects like a door handle or faucet knob?	1
Does washing my hands still significantly help in removing germs if afterwards I use my phone that I never wash, or put my hands in my pockets, or touch the bathroom doorknob?	1