Why did the white bear dissolve in water?
Because it was polar.
Explanation: Water is a 'polar' molecule, because it has a positive electrical charge and a negative electrical charge inside it. When this is the case, the molecule is called a 'polar molecule' meaning that it has electrical poles. (Otherwise it is called a 'non-polar molecule'.) Because of this, any other polar molecule can dissolve in water. Thus, the joke says a polar bear would dissolve in water!
How does a man on the moon get his hair cut?
My Brother’s Jokes
Wait, give me a minute.