/r/askscience

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We say the universe is roughly 13,75 * 10^9 years old. Given that time is relative, from what perspective is this measured?

1077 upvotes • Romgosch

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How do sharks smell blood 0.4km away? Does a particle of blood travel to their nose through the water?

1077 upvotes • ryan-a

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Would the sun's core be pitch black as it is too hot for the visible spectrum?

1076 upvotes • [deleted]

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Is charge always conserved?

1076 upvotes • anper29

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Would heavy unstable elements at the core of a star have a significantly extended half-life due to gravity?

1076 upvotes • SpectralMagic

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How many plants would I need to have in a sealed room with me to never run out of oxygen?

1075 upvotes • Studybuddies

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Does the way a person sleeps(on back, side or chest) effect bone growth and/or bone shape?

1075 upvotes • [deleted]

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Why does my biology teacher tell us that the formation of bonds between atoms stores energy and the breaking of them releases it, when my chemistry teacher tells us the opposite?

1075 upvotes • gregthegeek1

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How can sharks "smell" miles away?

1075 upvotes • [deleted]

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Will the Covid lockdowns have affected the rate that children catch and develop chickenpox?

1075 upvotes • Cheesefiend1

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
We say the universe is roughly 13,75 * 10^9 years old. Given that time is relative, from what perspective is this measured?	1077	Romgosch
How do sharks smell blood 0.4km away? Does a particle of blood travel to their nose through the water?	1077	ryan-a
Would the sun's core be pitch black as it is too hot for the visible spectrum?	1076	[deleted]
Is charge always conserved?	1076	anper29
Would heavy unstable elements at the core of a star have a significantly extended half-life due to gravity?	1076	SpectralMagic
How many plants would I need to have in a sealed room with me to never run out of oxygen?	1075	Studybuddies
Does the way a person sleeps(on back, side or chest) effect bone growth and/or bone shape?	1075	[deleted]
Why does my biology teacher tell us that the formation of bonds between atoms stores energy and the breaking of them releases it, when my chemistry teacher tells us the opposite?	1075	gregthegeek1
How can sharks "smell" miles away?	1075	[deleted]
Will the Covid lockdowns have affected the rate that children catch and develop chickenpox?	1075	Cheesefiend1