Before Mount Everest was discovered, what was the highest mountain in the world?

You stand in front of two doors. A guard stands next to each door. You know the following things: one path leads to paradise, the other leads to death. You cannot distinguish between the two doors. You also know that one of the two guards always tells the truth and the other always lies. You have permission to ask one guard one question to discover which door leads to paradise. What one question would you ask to guarantee you enter the door to paradise?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

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.

Decode the movie name from the below picture?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

A sundial has the fewest moving parts of any timepiece. Which has the most?

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

By using 'because' continuously three times, can you make an English statement ?

I always drive my customer away.

Who am I?