Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?

Can you name an animal whose killing cannot be performed without spilling your own blood?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

What is a word made up of 4 letters, yet is also made up of 3. Sometimes is written with 9 letters, and then with 4. Rarely consists of 6, and never is written with 5.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

What can go through glass without breaking it?

Bay of Bengal is in which state?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I can write cow in 13 letters.

Can You?