During which month do people sleep the least?

I am the fastest animal but cannot climb the tree. What am I?

Can you count the number of triangles in the picture below?

I make two people out of one. What am I?

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

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

They do not possess flesh or feathers or scales or bone
But still, they are blessed with fingers and thumbs of their own.

Can you place six X (crosses) in below board without making three in a row in any way ?

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

What's the only room from which no one can enter or leave