Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

If,
9 * 8 * 7 = 65
8 * 7 * 6 = 50
7 * 6 * 5 = 37

Find
6 * 5 * 4 = ?

A man was gazing through the window of the 23rd floor of the building. He suddenly opened the window and jumped on the other side of the window. On landing on the floor, there was not a sheer mark of injury on him.

How can that be possible if he did not use any kind of parachute and did not land on a soft surface?

Replace the question mark in the picture below.

Out of four images which one is the odd one out?

You need to climb ten stairs. At every stair, you can either take one step up or you can jump two steps up.

In how many different ways you can climb 10 stairs?

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

Why Wine Glass Stem is so long?

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

Why is the Hole below a Lock?