I have teeth but i don't bite. Who Am I ?

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

How can a man go eight days without sleep?

Can you identify if it's a murder or a suicide ?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

Before Mount Everest was discovered, what was the highest mountain in the world?

There was a man he lives in a hotel each morning he presses the first floor button each evening if there is a person in the elevator he asks him to press the 10 floor button if there is no one in the elevator he takes the stairs why.