/r/askscience

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Why do 3D models of the universe look like an hourglass?

737 upvotes • [deleted]

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When I cut something, what is happening to it at a small scale? Atomic/molocule level?

737 upvotes • riley13w

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How did the first atoms come into existence and how do we know that?

737 upvotes • VegetarianReaper

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Is there a scientific explanation for the satisfying sensation of rubbing one's eyes when tired?

736 upvotes • silasioalejandro

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My brother just ran straight from the sauna to the snow outside. Other crazy finns like to swim in the freezing water during the winter. What does research say about the effects on the body when this is done repeatedly?

736 upvotes • Eiskis

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Do animals like dogs or cats experience an oxytocin response when humans pet them?

736 upvotes • Ignitus

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I feel dumb for asking this... but how come using air to move a turbine to generate energy doesn't eliminate the energy from the system (i.e., less "wind")?

736 upvotes • Spam4119

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does flying through clouds have any effect on the speed of an aircraft?

736 upvotes • ConstantBad

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How did someone find out that the speed of light is approximately 300,000 km/s?

735 upvotes • General-Graardor

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Happy holidays to you! And a special thanks to our Moderators, Panelists and Users.

735 upvotes • MockDeath

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Why do 3D models of the universe look like an hourglass?	737	[deleted]
When I cut something, what is happening to it at a small scale? Atomic/molocule level?	737	riley13w
How did the first atoms come into existence and how do we know that?	737	VegetarianReaper
Is there a scientific explanation for the satisfying sensation of rubbing one's eyes when tired?	736	silasioalejandro
My brother just ran straight from the sauna to the snow outside. Other crazy finns like to swim in the freezing water during the winter. What does research say about the effects on the body when this is done repeatedly?	736	Eiskis
Do animals like dogs or cats experience an oxytocin response when humans pet them?	736	Ignitus
I feel dumb for asking this... but how come using air to move a turbine to generate energy doesn't eliminate the energy from the system (i.e., less "wind")?	736	Spam4119
does flying through clouds have any effect on the speed of an aircraft?	736	ConstantBad
How did someone find out that the speed of light is approximately 300,000 km/s?	735	General-Graardor
Happy holidays to you! And a special thanks to our Moderators, Panelists and Users.	735	MockDeath