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

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Does sunscreen block the synthesis of both vitamin D and β-endorphin in the skin when out in the sun?

1449 upvotes

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How long is someone actually contagious for after they first get a cold?

3 upvotes

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I can't seem to find any great information on this on the web. How/why do some adults develop food allergies seemingly randomly later in life?

1 upvotes

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How long is room-temp water safe to be left out before it becomes unsafe?

1 upvotes

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Why does pooping feel so good?

1 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
Does sunscreen block the synthesis of both vitamin D and β-endorphin in the skin when out in the sun?	1449
How long is someone actually contagious for after they first get a cold?	3
I can't seem to find any great information on this on the web. How/why do some adults develop food allergies seemingly randomly later in life?	1
How long is room-temp water safe to be left out before it becomes unsafe?	1
Why does pooping feel so good?	1