"I'll have an H2O," says the first.
"I'll have an H2O too," says the second.
The second man dies.
Guy #1: "Do you know the chemical formula for Sodium Bromide?
Guy #2: "NaBro."
A science teacher tells his class, "Oxygen is a must for breathing and life. It was discovered in 1773."
A not so bright student responds, "Thank God I was born after 1773! Otherwise I would have died without it."
A scientist wanted to understand the science of marriage.
So he got married.
Now he forgot what science is all about.