Prove that twice of ten is the same as twice of eleven.

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Can you replace the question mark with the correct number in the below table sequence?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

There is a box in which distinct numbered balls have been kept. You have to pick two balls randomly from the lot.

If someone is offering you a 2 to 1 odds that the numbers will be relatively prime, for example
If the balls you picked had the numbers 6 and 13, you lose $1.
If the balls you picked had the numbers 5 and 25, you win $2.

Will you accept that bet?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Today, I celebrated my 32nd birthday but I was born in 1972.
How is this possible?

What always comes into a house through the keyhole?