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

For this puzzle, you might have to find logic in something illogical. But hey, it's fun and a healthy little break from your strenuous puzzle-solving sessions.

Can you decipher the meaning in the following cluster of letters?

ITIT,NCENTCENT

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

What time is it when an elephant sits on a fence?

What does this simple rebus mean?