/u/zjm555's posts in /r/askscience

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When a water filter (e.g. Brita filter) is past its expiration date, is it just not filtering very well anymore, or is it actively making the water worse?

4578 upvotes

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Would it make any sense to pad the outside of a football helmet?

91 upvotes

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What is so bad about having an improper "gut flora"?

6 upvotes

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How long would it take for a bullet fired (from a rifle or handgun, your choice) into water take to reach terminal velocity? And, at what depth would it no longer be harmful to a human?

0 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
When a water filter (e.g. Brita filter) is past its expiration date, is it just not filtering very well anymore, or is it actively making the water worse?	4578
Would it make any sense to pad the outside of a football helmet?	91
What is so bad about having an improper "gut flora"?	6
How long would it take for a bullet fired (from a rifle or handgun, your choice) into water take to reach terminal velocity? And, at what depth would it no longer be harmful to a human?	0