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

People put me on the table and cut me but do not eat me. What am I?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

"deb mitciv eht edisni neddih si nopaew redrum ehT"

Tell me the location of the murder weapon.

There are three boxes of different sizes with three cupcakes inside each of the boxes in Christina's kitchen. At night her daughter wakes up and goes to the kitchen. She opens a box and eats all three cakes.

But in the morning Christina finds out that each box still had three cupcakes. How?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

What can you catch but never throw?

I look at you, you look at me I raise my right, you raise your left. What am I?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

Can you fill the blank with the correct number?

6 30 870 756030 _____