Math/Science Puns and Jokes!

[Procinogen]

At school, I'm known to be the guy that makes a lot of puns (terrible or not), next to one of my best friends. really like puns and jokes, especially science and math ones. So with that said, this is just kind of a thread where we can post our cheesiest and best science/math related puns and jokes. I have one to start:
A quantum particle walks into a bar, and keeps going. BADUM TSS

 

[Creeping Death]

Pavlov.... hmm, that name rings a bell

 

[Rixus]

Singerine = Tangerine.
Cosgerine

 

[Rixus]

Pavlov.... hmm, that name rings a bell

Ah, the tragedy of Pavlov. They say that in the end, anytime a phone rang he would jump into the air and scream, "I have to feed my dogs!"