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

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

A blonde put eyeliner on her head. Why?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Who are the happiest people in IPL match?

What is at the end of a rainbow?

Shyla was sleeping in her apartment when suddenly a robber broke into her house. He asked her to stay quiet and started looting the cash and jewelry. Suddenly the landline phone started ringing. The robber pointed a gun at Shyla and asked her to pick up and talk without giving away the situation.

She picked up the phone and it happened to be her husband. She spoke, Is it an emergency darling? Do give me a call when your flight lands, I will prepare your favorite food that will help you relieve the stress. Then she hanged up.

10 minutes after, the police arrive at the scene and catch the robber. How did the police know about the robbery?

A Car is crossing a bridge 2 miles long. The bridge can only hold 10000 lbs, which is the exact weight of the car. The Car makes it half way across the bridge and stops. A bird lands on the car. Does the bridge collapse? Explain.