Riddle: The more you take, the more you leave behind. "What am I?"
Answer: You take footsteps and leave footprints.
Riddle: Poor people have it. Rich people need it. If you eat it you die. What is it? 
Answer: Nothing.
Riddle: I'm tall when I'm young and I'm short when I'm old. What am I?
Answer: A candle or a pencil.
Riddle: What travels around the world but stays in one spot?
Answer: A stamp.
Riddle: What has hands but can not clap?
Answer: A clock.
Riddle: What is so delicate that saying its name breaks it?
Answer: Silence.
Riddle: What is as big as you are and yet does not weigh anything?
Answer: Your shadow.
Riddle: Paul's height is six feet, he's an assistant at a butcher's shop, and wears size 9 shoes. What does he weigh?
Answer: Meat.
Riddle: How can you make seven even?
Answer: Remove the letter S.
Riddle: What has 88 keys, but can't even open a single door?
Answer: A piano.