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

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

What brings you down but never up?

What kind of band never plays music?

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

You can see three almost identical images below. Can you spot the odd one out from them?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

Spot the cat in the picture below