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

Can you find the mistake in the below statement?

Who has married many women but was never married?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

How can one talk without saying a single word?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Krish is 45 years old and his mother Crishtina is 73 years old.

Can you find out how many years ago, his mother was three times his age?

Which is faster, Heat or Cold ? Explain.

A lion and its tamer are standing inside a cage that measures 1 unit in radius. Both of them can effortlessly run at the speed of 1 unit maximum.

1) Suppose the lion is hungry, will he be able to eat up the tamer?
2) If yes, how long can the tamer survive?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?