100+ Brain teasers with answers for kids and adults

What has no hands but might knock on your door, and if it does you better open up?

There is a word in the English language in which the first two letters signify a male, the first three letters signify a female, the first four signify a great man, and the whole word, is a great woman. What is the word?

In my hand I have two coins that are newly minted. Together, they total 30 cents. One isn't a nickel. What are the coins? 

You have a rope that burns in exactly 30 minutes. The rope doesn't burn at a uniform rate. How can you measure exactly 15 minutes using this rope?

What runs all around a backyard, yet never moves?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

A man was walking in the rain. He was in the middle of nowhere. He had nothing and nowhere to hide. He came home all wet, but not a single hair on his head was wet. Why is that?

How far can a rabbit run into the woods?

In a year, there are 12 months. Seven months have 31 days. How many months have 28 days?

What can be swallowed, but can also swallow you?

What can be stolen, mistaken, or altered, yet never leaves you your entire life?

What goes through cities and fields, but never moves?

Two mothers and two daughters went out to eat. Everyone ate one burger, yet only three burgers were eaten in all. How is this possible?

During which month do people sleep the least?

What tastes better than it smells ?