Easy

Lots of them make up a word, And lots of words are in them. It's easy when you think about it. A while ago we stamped and mailed them.

related riddles

Mary was born on December 25th, yet her birthday is always in the summer. How is this possible?

What shoes should you wear when your basement is flooded?

It's in your hand though you cannot feel it. Only you and time can reveal it.