Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?

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

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?

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

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

What have one eye but still cannot see?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Which letter of the alphabet has the most water?