Name an ancient invention, which is still used in some parts of the world today, that allows people to see through walls.
What can this be?
Hint: There are often lots of these everywhere you look.
Answer: A window.
What number comes next in this sequence:
1 4 1 5 9 2 ==?==
Hint: The true sequence has a 3 at the start.
These are the decimal places of Pi.
What is the next number in this sequence:
1 2 3 4 ==?==
Hint: A very, very easy puzzle?