/r/askscience

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Only show posts with narrations

How do we measure the height of mountains on planets with no sea level?

6692 upvotes • Thufirrk

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Why do some viruses, such as influenza, quickly mutate (thus require different vaccinations annually), but other viruses, such as smallpox seem to barely mutate at all (or at least much more slowly)?

6682 upvotes • ButternutSasquatch

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Do plants receive a measureable amount of energy from starlight other than the Sun, versus if they were in total darkness?

6677 upvotes • Letchworth

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Is a spider's vision stitched together like ours?

6674 upvotes • abicepgirl

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Why are there many different types of fuel (87, 93, diesel) and why can certain machines take only one type?

6674 upvotes • Paynful_Force

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If someone gets a blood transfusion, wouldn’t they have a mishmash of genetic material appear in a DNA test?

6668 upvotes • nutoreddit

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Are there types of cancer that are rising in incidence and that are unrelated to smoking/drinking/sun/old age?

6667 upvotes • ohlordwhywhy

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Do (fighter) airplanes really have an onboard system that warns if someone is target locking it, as computer games and movies make us believe? And if so, how does it work?

6666 upvotes • bamsnl

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Why do sunburns start to hurt after you get out of the sun? Why don’t we notice the pain while we are in the sunlight?

6664 upvotes • kaitfm

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How did ancient people keep stored water supplies such as cisterns safe to drink?

6664 upvotes • Jet-Streem

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
How do we measure the height of mountains on planets with no sea level?	6692	Thufirrk
Why do some viruses, such as influenza, quickly mutate (thus require different vaccinations annually), but other viruses, such as smallpox seem to barely mutate at all (or at least much more slowly)?	6682	ButternutSasquatch
Do plants receive a measureable amount of energy from starlight other than the Sun, versus if they were in total darkness?	6677	Letchworth
Is a spider's vision stitched together like ours?	6674	abicepgirl
Why are there many different types of fuel (87, 93, diesel) and why can certain machines take only one type?	6674	Paynful_Force
If someone gets a blood transfusion, wouldn’t they have a mishmash of genetic material appear in a DNA test?	6668	nutoreddit
Are there types of cancer that are rising in incidence and that are unrelated to smoking/drinking/sun/old age?	6667	ohlordwhywhy
Do (fighter) airplanes really have an onboard system that warns if someone is target locking it, as computer games and movies make us believe? And if so, how does it work?	6666	bamsnl
Why do sunburns start to hurt after you get out of the sun? Why don’t we notice the pain while we are in the sunlight?	6664	kaitfm
How did ancient people keep stored water supplies such as cisterns safe to drink?	6664	Jet-Streem