What is the centre of gravity?

Outside a massage parlour, there is a board that reads
"I only massage those who do not massage themselves."

Reading the above statement, does the masseur massage himself?

What is the fastest way to double your money?

What country can make you shiver?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

What has one eye, but can’t see?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

There are three houses in a straight row. One is red, one is blue, and one is white. The red house is left of the middle. The blue house is right of the middle. Where's the white house?

Find the smallest sentence with all the English alphabet.