What you do to determine the length of something
Of these everyone has ten, part of two wholes at the arms end. What are they?
You can't keep this until you have given it. What is it?
Brings celebrities into your home every night.
A sphere has three, a circle has two, and a point has zero. What is it?
Poor people have it. Rich people need it. If you eat it you die. What is it?