How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

What Adam and Eve do not have but the rest of the people have?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

Can you solve below mathematical equation?

2^1234 - 2^1233

You are a cab driver who pools passengers. You pick 3 people from a destination and drop 1 after an hour. 2 people climb aboard at the same time and you drop 3 at the next destination. After some time, you pick 2 passengers only to drop 1 after a short distance where 3 more passengers climb up the cab. You leave the rest of the passengers one by one to their destination and then come back home.

Can you tell the eye color of the cab driver?

Can you make a six-letter word using the letters N, A and B ?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?