If you say my name, I will no longer exist. What am I?

Can you solve below mathematical equation?

2^1234 - 2^1233

You can hear me, but you can't touch or see me.

What am I?

Can you find the company name in the pictogram below?

Replace the question mark with the correct number in below Picture:

why number 8549176320 is one of a kind?

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

I look at you, you look at me, I raise my right, you raise your left. What am I?

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?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?