What month of the year has 28 days?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

I can be cracked, made, told, and played. What am I?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

What do you answer even though it never asks you questions?

A girl is twice as old as her brother and half as old as her father. In 50 years, her brother will be half as old as his father. How old is the daughter now?