/u/jim45804's posts in /r/askscience

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It's well known that cannabis is stronger today than it used to be. Does the same apply to coffee beans? Have they been selectively bred to produce more caffeine?

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Are there any species that would go extinct if humans suddenly disappeared?

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What species of bird has the most conspicuous physical differences between male and female?

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Are there any compelling theories that the universe will ultimately reverse expansion?

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Is there any material that could contain helium indefinitely and light and strong enough to use as a balloon?

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What do spiders think about when waiting for a bug to land on their webs?

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Why can't I hear anything while yawning?

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Why when I hear someone clear their throat do I feel a need to clear my own throat?

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How small would a particle have to be to orbit around me if I was in deep space?

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Is the female/male athletic achievement gap (e.g. sports records, integration) narrowing? What are the causes?

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
It's well known that cannabis is stronger today than it used to be. Does the same apply to coffee beans? Have they been selectively bred to produce more caffeine?	1
Are there any species that would go extinct if humans suddenly disappeared?	1
What species of bird has the most conspicuous physical differences between male and female?	1
Are there any compelling theories that the universe will ultimately reverse expansion?	1
Is there any material that could contain helium indefinitely and light and strong enough to use as a balloon?	1
What do spiders think about when waiting for a bug to land on their webs?	1
Why can't I hear anything while yawning?	1
Why when I hear someone clear their throat do I feel a need to clear my own throat?	1
How small would a particle have to be to orbit around me if I was in deep space?	1
Is the female/male athletic achievement gap (e.g. sports records, integration) narrowing? What are the causes?	1