An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

What is the next number in this matchsticks series riddle?

If eleven plus two equals one, what does nine plus five equal?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?

Why is the Hole below a Lock?

A pregnant woman is preparing to name her seventh child. Her children's names so far are Dominique, Regis, Michelle, Fawn, Sophie, and Lara. What will she name her next child -- Jessica, Katie, Abby or Tilly?

You can see it everyday, But cannot touch it at will. What is it?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

When a clock is observed, the hour hand is at a minute mark and the minutes hand is six minutes ahead of it.

When the clock is observed again after some time, the hour hand is precisely on a different minute mark and the minute hand is seven minutes ahead of it.

Can you calculate how much time has elapsed between the two observations?