Can you convert the number zero(0) into a positive number using just one mathematical operator ?

The more it dries, the wetter it becomes. Can you tell what it is?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

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.

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

what's the probability of getting a king or a queen from a pack of 52 cards?

Do You See It?

What breaks yet never falls, and what falls yet never breaks?

Which is the rope you never skip with?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?