/r/askscience

Year:

Only show posts with narrations

Does Adrenaline really reduce reaction time?

3165 upvotes • Pinkie056

Mark as read: Add to a list

"The International Union of Pure and Applied Chemistry (IUPAC) defines an element to exist if its lifetime is longer than 10^−14 seconds (0.01 picoseconds, or 10 femtoseconds), which is the time it takes for the nucleus to form an electron cloud." — What does this mean?

3165 upvotes • GoogieK

Mark as read: Add to a list

Around 550 million years ago the earth's magnetic field almost collapsed, but then strengthened a few million years later. Scientists say this may have been due to the formation of the inner core. But why exactly would that cause the magnetic field to get stronger?

3164 upvotes • somethingX

Mark as read: Add to a list

Has Rosetta significantly changed our understanding of what comets are?

3163 upvotes • curious_electric

Mark as read: Add to a list

What is the maximum speed of a liquid running through a tube?

3163 upvotes • Wilc0NL

Mark as read: Add to a list

Why do so many tarantula species contain the word "Baboon"?

3162 upvotes • TitanFallout

Mark as read: Add to a list

Why Is Epinephrine Used With Lidocaine In Local Anesthesia Rather Than Norepinephrine?

3162 upvotes • lift_fit

Mark as read: Add to a list

AskScience AMA Series: I am Joseph LeDoux, a neuroscientist at NYU. My research focuses on how the brain detects and responds to danger, and the implications for understand fear and anxiety. Ask Me Anything!

3160 upvotes • AskScienceModerator

Mark as read: Add to a list

Is there a limit to how many photons you can pack into a beam of defined width? Or to ask the other way - can an infinite number of photons occupy the same space?

3157 upvotes • iphark

Mark as read: Add to a list

Am I, as a human, closer in size to the earth or an atom?

3156 upvotes • Ah-Um

Mark as read: Add to a list

Title	Upvotes	Author	Mark as read	Favorited	Rating	Add to a list
Does Adrenaline really reduce reaction time?	3165	Pinkie056
"The International Union of Pure and Applied Chemistry (IUPAC) defines an element to exist if its lifetime is longer than 10^−14 seconds (0.01 picoseconds, or 10 femtoseconds), which is the time it takes for the nucleus to form an electron cloud." — What does this mean?	3165	GoogieK
Around 550 million years ago the earth's magnetic field almost collapsed, but then strengthened a few million years later. Scientists say this may have been due to the formation of the inner core. But why exactly would that cause the magnetic field to get stronger?	3164	somethingX
Has Rosetta significantly changed our understanding of what comets are?	3163	curious_electric
What is the maximum speed of a liquid running through a tube?	3163	Wilc0NL
Why do so many tarantula species contain the word "Baboon"?	3162	TitanFallout
Why Is Epinephrine Used With Lidocaine In Local Anesthesia Rather Than Norepinephrine?	3162	lift_fit
AskScience AMA Series: I am Joseph LeDoux, a neuroscientist at NYU. My research focuses on how the brain detects and responds to danger, and the implications for understand fear and anxiety. Ask Me Anything!	3160	AskScienceModerator
Is there a limit to how many photons you can pack into a beam of defined width? Or to ask the other way - can an infinite number of photons occupy the same space?	3157	iphark
Am I, as a human, closer in size to the earth or an atom?	3156	Ah-Um