/r/askscience

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What percentage of the calories that a human consumes is actually consumed by intestinal flora?

846 upvotes • dragodon64

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Is there any evidence of allopatric speciation caused by the Great Wall of China or other manmade structures?

846 upvotes • BrokeDiamond

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Is it possible to determine our birthdate from our bodies through some biological/chemical/physical means?

846 upvotes • eipimo

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If two self-driving cars are on the road next to each other, and their ultrasonic sensors are projecting the same frequency, would the data become muddled? How can the manufacturers account for this?

846 upvotes • TheRealSwoop

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Does it matter where you adjust the volume of headphones?

846 upvotes • ArenLuxon

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Why does the thyroid use iodine ?

846 upvotes • geistererscheinung

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Can we synthesize human blood? If not, why is it that we can't?

845 upvotes • kgros004

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Considering that there are hundreds of billions of galaxies in the known universe, approximately how many times per day does a star somewhere in the universe go supernova? More than once per second?

845 upvotes • Stuck_In_the_Matrix

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How does a black hole's singularity not violate the Pauli exclusion principle?

845 upvotes • Yeti100

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Just like in supersonic motion, the object that creates the sound can move faster than the waves it produces, is it possible for the E-field or B-field that make up light to move faster than the light?

845 upvotes • SukebeSensei

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Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
What percentage of the calories that a human consumes is actually consumed by intestinal flora?	846	dragodon64
Is there any evidence of allopatric speciation caused by the Great Wall of China or other manmade structures?	846	BrokeDiamond
Is it possible to determine our birthdate from our bodies through some biological/chemical/physical means?	846	eipimo
If two self-driving cars are on the road next to each other, and their ultrasonic sensors are projecting the same frequency, would the data become muddled? How can the manufacturers account for this?	846	TheRealSwoop
Does it matter where you adjust the volume of headphones?	846	ArenLuxon
Why does the thyroid use iodine ?	846	geistererscheinung
Can we synthesize human blood? If not, why is it that we can't?	845	kgros004
Considering that there are hundreds of billions of galaxies in the known universe, approximately how many times per day does a star somewhere in the universe go supernova? More than once per second?	845	Stuck_In_the_Matrix
How does a black hole's singularity not violate the Pauli exclusion principle?	845	Yeti100
Just like in supersonic motion, the object that creates the sound can move faster than the waves it produces, is it possible for the E-field or B-field that make up light to move faster than the light?	845	SukebeSensei