The more of this there is, the less you see. What is it?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

How many times can you subtract the number two from the number fifty?

I make two people out of one. What am I?

John was piloting a plane behind a car but was never able to overtake it. Why?

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"

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?