Why is it very easy to weigh a fish?

What does below pictogram mean?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

I have no life, but I can die. What am I?

What is both possible and impossible at the same time?

A wealthy man lives alone in a small cottage. Being partially handicapped he had everything delivered to his cottage. The mailman was delivering a letter one Thursday when he noticed that the front door was ajar. Through the opening he could see the man's body lying in a pool of dried blood. When a police officer arrived he surveyed the scene. On the porch were two bottles of warm milk, Monday's newspaper, a catalog, flyers, and unopened mail. The police officer suspects it was foul play. Who does he suspect and why?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Give it food and it will live; give it water and it will die.

Solve the mathematical equation in the picture below.

During a secret mission, an agent gave the following code to the higher authorities
AIM DUE OAT TIE MOD

However, the information is in one word only and the rest are fake. To assist the authorities in understanding better, he also sent them a clue, If I tell you any one character of the code, you can easily find out the number of vowels in the codeword.

Can you find out the code word?