/r/askscience

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How does sunscreen protect my skin if it’s clear? It blocks UV— so if I were, say an insect that sees in the UV spectrum, would sunblocked skin look extra bright because UV is reflected, or extra dark because UV is absorbed?

1117 upvotes • LorenaBobbedIt

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The Moon is spiraling away from Earth at an average rate of 3.8 cm per year, so when it was formed it would have been much closer to Earth. Does it follow that tides would have been greater earlier in Earth's history? If so how large?

1116 upvotes • CockroachED

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What happens to the deposit of tar and other chemicals in the lungs if a smoker stops smoking?

1116 upvotes • gorginfoogle

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Do crickets respond to TV’s and video audio, with their own sounds?

1116 upvotes • Bony_Geese

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It's blazing hot in your room. You open the window and put a fan in it. Do you blow the hot air out? Or blow the cold air in?

1115 upvotes • Lividlavidaloca

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During the carboniferous period, the oxygen level was 35%. Why did the oxygen level drop?

1115 upvotes • fangfufu

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Do other animals ever get chapped lips? Or is that a distinctly human problem?

1115 upvotes • El_Monstero29

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What's the expected lifetime of the Hoover Dam?

1114 upvotes • rroach

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Is it possible to create a microscopic flame?

1112 upvotes • Phydeaux

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If a phone is plugged in to a charger and the battery is full, does the phone use the battery or the charger as a power source?

1112 upvotes • AtheistKiwi

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
How does sunscreen protect my skin if it’s clear? It blocks UV— so if I were, say an insect that sees in the UV spectrum, would sunblocked skin look extra bright because UV is reflected, or extra dark because UV is absorbed?	1117	LorenaBobbedIt
The Moon is spiraling away from Earth at an average rate of 3.8 cm per year, so when it was formed it would have been much closer to Earth. Does it follow that tides would have been greater earlier in Earth's history? If so how large?	1116	CockroachED
What happens to the deposit of tar and other chemicals in the lungs if a smoker stops smoking?	1116	gorginfoogle
Do crickets respond to TV’s and video audio, with their own sounds?	1116	Bony_Geese
It's blazing hot in your room. You open the window and put a fan in it. Do you blow the hot air out? Or blow the cold air in?	1115	Lividlavidaloca
During the carboniferous period, the oxygen level was 35%. Why did the oxygen level drop?	1115	fangfufu
Do other animals ever get chapped lips? Or is that a distinctly human problem?	1115	El_Monstero29
What's the expected lifetime of the Hoover Dam?	1114	rroach
Is it possible to create a microscopic flame?	1112	Phydeaux
If a phone is plugged in to a charger and the battery is full, does the phone use the battery or the charger as a power source?	1112	AtheistKiwi