Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

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

Can you tell a 3D object that has just two surfaces?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

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?

John is on an island and there are three crates of fruit that have washed up in front of him. One crate contains only apples. One crate contains only oranges. The other crate contains both apples and oranges.

Each crate is labelled. One reads 'apples', one reads 'oranges', and one reads 'apples and oranges'. He know that NONE of the crates have been labeled correctly - they are all wrong.

If he can only take out and look at just one of the pieces of fruit from just one of the crates, how can he label all of the crates correctly?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

James bond was pushed out of an aeroplane without any parachute.
He survived, How come?

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?