There are forty elephants and they have forty-fore heads. How can this be possible?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

In the addition below, all digits have been replaced by letters. Equal letters represent equal digits and different letters represent different digits.
ABCABA
BBDCAA
ABEABB
ABDBAA
------- +
AAFGBDH
What does the complete addition look like in digits?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Which alphabet letter is a question?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

What makes this number unique: 8,549,176,320?

The following four words might seem abrupt to you. But you can make them meaningful by just adding vowels.
RDSH
GGPLNT
TMT
NN

Hint: All of them are vegetables.

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?