When the son of the water returns to the parent, it dies. What is it?

Which is heavier, a pound of bricks or a pound of feathers?

What did the angry electron say when it was repelled?

What did the scientist say when he found 2 atoms of helium?

What do you do with a dead chemist?

What is the center of gravity?

What can eat a lot of iron without getting sick?

Many have heard it, but nobody has ever seen it. It will not speak back until spoken to. What is it?

Did you hear the one about a chemist who was reading a book about helium?

What kind of fish chases a mouse?