What runs around the whole yard without moving?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

What is the centre of gravity?

If eleven plus two equals one, what does nine plus five equal?

What goes up but never comes down?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

Why did Buffon take the goal with him after every Juventus match?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?