The optimist sees the glass half full.
The pessimist sees the glass half empty.
The chemist see the glass completely full, half in the liquid state and half in the vapor state.
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A photon is checking into a hotel and the bellhop asks him "Do you have any luggage?"
The photon replies, "Nope, I'm traveling light."
Q: What did the scientist say when he found 2 isotopes of helium?
A: HeHe
Parallel lines have so much in common.
It's a shame they'll never meet.
Q: If H2O is the formula for water, what is the formula for ice?
A: H2O cubed.
Chuck Norris destroyed the periodic table, because Chuck Norris only recognizes the element of surprise.
Vote:
Q: Why was Pavlov's hair so soft?
A: Classical conditioning.
Q: What do chemists call a benzene ring with iron atoms replacing the carbon atoms?
A: A ferrous wheel.
An instructor in chemical warfare asked soldiers in his class: "Anyone knows the formula for water?"
"Sure. That's easy," said one man.
"What is it?"
"H, I, J, K, L, M, N, O."
"What, what?" reasked the instructor.
"H to O," explained the chemistry expert.
A scientist tells a pharmacist, "Give me some prepared tablets of acetylsalicylic acid."
"Do you mean aspirin?" asks the pharmacist.
The scientist slaps his forehead. "That's it!" he says. "I can never remember the name."
Three statisticians are out hunting.
Suddenly, a deer appears 50 yards away.
The first statistician shoots and hits the tree 5 feet to the left.
The second statistician shoots and hits the tree 5 feet to the right.
The third statistician starts jumping up and down, yelling "We got him! We got him!"