what does the below rebus means?

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

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

Find The Missing Number In the Sequence.
6 25 64 ? 32 1

O_er_t_o_

Complete the missing letters of the given word.

What four weights can be used to balance from 1 to 30 pounds?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

What happened when the wheel was invented?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?