You enter the laboratory and see a science experiment. How will you know which class is it?

If the science experiment is green and wiggles, it’s biology.
If the science experiment stinks, it’s chemistry.
If the science experiment doesn’t work, it’s physics.

Funny Joker : I love funny jokes which is probably why I own this very funny jokes website :-) The jokes here are NOT work friendly, you've been warned.

Website - Really Funny Jokes