What goes up but never comes down?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

How can you tell a raw egg from a hard-boiled egg?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

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

Can you quickly find which two matchstick figures are identical?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.