What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

What month of the year has 28 days?

Can you spot the hidden girl in the picture below?

No one wants to have it, but if one got it, he does not want to lose it. What is It?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Look at the picture and find out which square is not linked with any of the other squares.

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

A guy in his thirties is found dead in a forest. The shocking thing about the body is that he is wearing his swimming trunks snorkel and a facemask.

For your information, the nearest lake is some 10 miles away and the sea is hundreds of miles away.

How did he die then?

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?