Answer:
When you put this in a heavy wooden box the box will become lighter
There are 20 birds in a tree. A man comes and shoots one of the birds. How many birds are left?
What goes up the hill and down the hill, And spite of all, yet stand still?
How do you blink twice without blinking twice?
What can I not be tomorrow?
What is it that makes tears without sorrow. And takes its journey to heaven?