"Survivor" Immunity Challenge: Solve the Riddle (Again)

What has many keys but can’t open a single lock?

Where does today come before yesterday?

What goes up and down but doesn’t move?

It belongs to you, but other people use it more than you do. What is it?

What has one head, one foot and four legs?

Mary has four daughters, and each of her daughters has a brother. How many children does Mary have?

A man describes his daughters, saying, “They are all blonde, but two; all brunette but two; and all redheaded but two.” How many daughters does he have?