Score
Title
437
AskScience Panel of Scientists XVII
868
I know it takes two weeks for the flu vaccine to be fully effective. I assume effectiveness is zero right before the vaccine is administered, and maximum after two weeks. But is there a graph that shows how effectiveness changes in time?
8616
Why is the Congo River so deep?
37
Why is the separation constant for the radial equation of the Hydrogen atom in the form of L(L+1)?
17
If the capacity of a battery charging another battery drops below that of the receiving battery, will it stop transferring electricity since the electrons will no longer prefer to leave the lower energy "state" of the drained battery?
35
How/why are so many mathematical proofs and theorems contingent on the Riemann hypothesis being true?
7444
Are there any predators that hunt for sport rather than for food?
18
Do they update the voyager software?
20
Does language affect learning and studying?
23
When water does down the drain, why does it always go down the drain in a form of whirlpool.?
1
How did the Russian Woodpecker receiver work?
11
From what I have learnt so far, refrigerators use chlorofluorocarbons for cooling. Do these chlorofluorocarbons run out after some time? If yes how are they replenished?
16
What makes things transparent?
17
What allows certain cars and airplanes to have their own Wifi?
29
What causes the thick mist/fog that I frequently see coming off of mountains in my area?
11
What exactly happens to a person's behavior after a lobotomy?
7
How Bayes rule was used to help with aiming cannons?
3
Is a Colliod a state of matter?
5
Is there a limit to the energy density of batteries?
0
What kind of waves on the Electromagnetic Spectrum do metal detectors use to isolate only metal and no other materials?
7
How do particle accelerators such as the LHC detect particle collision products?
21
Many poisonous and venomous vertebrates get their toxins from toxic arthropods that form part of their diets. Why can't they just form the toxins themselves the same ways their prey do?
194
Why are hail storms so short?
68
If aliens were to look at earth through a telescope from 65 million lightyears away, would they see dinosaurs?
13
Why does fire flicker?
34
What exactly is string theory and how does it work?
10724
What exactly does the cold virus do to me to make me so weak?
8
I understand conduction and radiation as modes of heat transfer, but convection confuses me. Why does fluid moving over an object remove heat from it as opposed to adding heat due to friction?
3
How do marine mammals keep their testes cool?
12
Are initial telomere lengths fairly consistent in mammals? Barring external circumstances, do they decay at the same rate?
2
Is it possible light has a mass?
7
How much does it actually cost to maintain the internet?
14
What happens to the brain as you fall asleep? Are certain proteins released to induce sleep? Is it seen as a voluntary or involuntary action?
9
How do transitors amplify?
17
Why does an animal like the sea otter have a long gestation period (145-325 days) but only have a lifespan of 15 years or so. Is there a relationship between gestation period and lifespan across marine mammals like that/or any other mammal?
9
Which modern encryption standards would be both practical to implement on a large scale using technology from the 1940s and still effectively unbreakable today?
13
What is the significance of a quasar discovered at 690 million years after big bang?
5
Why do we find little animals cute?
5
How do drug companies decide on the form(s) of delivery for a given drug?
2
Why does water not heat up through the friction created by movement (ocean waves/shaking it in a bottle)?
3
Will the "dark" side of the Moon become visible from earth?
5 cantgetno197 Atoms formed precisely when the average energy density (i.e. temperature) dropped below the ionization energy of hydrogen at ~ 4000 K.* At that moment, everywhere in the universe, there was a mass condensation of hydrogen atoms. Before that everything was an ionized plasma (of disassociated electrons and protons), which is quite opaque, and light was trapped to a life of not getting very far (though it certainly existed, unlike what others here have incorrectly said). After all that plasma collapsed into hydrogen atoms things became much more transparent and everywhere in the universe light, with a specific spectrum associated with the black-body (i.e. thermal radiation) emission of a body at the temperature of hydrogen formation), was set free. This light still exists today, everywhere and in every direction. We call it the Cosmic Microwave Background Radiation or CMB. This event was called Recombination (or Photon Decoupling, and yes I know that's sliiigghhhttlllyy different) and happened about 400,000 years after the Big Bang. Of course I'm assuming by 'matter' you mean atoms. Before atom formation their were hadrons (Hadron epoch) and before that quarks (Quark epoch). *A realistic model is a little more complex than this, don't take this value super seriously.
5 0 cantgetno197 Atoms formed precisely when the average energy density (i.e. temperature) dropped below the ionization energy of hydrogen at ~ 4000 K.* At that moment, everywhere in the universe, there was a mass condensation of hydrogen atoms. Before that everything was an ionized plasma (of disassociated electrons and protons), which is quite opaque, and light was trapped to a life of not getting very far (though it certainly existed, unlike what others here have incorrectly said). After all that plasma collapsed into hydrogen atoms things became much more transparent and everywhere in the universe light, with a specific spectrum associated with the black-body (i.e. thermal radiation) emission of a body at the temperature of hydrogen formation), was set free. This light still exists today, everywhere and in every direction. We call it the Cosmic Microwave Background Radiation or CMB. This event was called Recombination (or Photon Decoupling, and yes I know that's sliiigghhhttlllyy different) and happened about 400,000 years after the Big Bang. Of course I'm assuming by 'matter' you mean atoms. Before atom formation their were hadrons (Hadron epoch) and before that quarks (Quark epoch). *A realistic model is a little more complex than this, don't take this value super seriously.