## Nothing Serious

When I’m first said,
I’m quite mysterious,
But when I’m explained,
I’m nothing serious.

What am I?

## Complex Timepiece

A sundial has the fewest moving parts of any timepiece. Which has the most?

The hourglass, it has thousands of grains of sand.

## The Pasta Puzzle

You have 10 strings of pasta left on your plate. You randomly start tying up their ends, until there are no loose ends anymore. What is the average number of loops which are created?

The expected (average) number of loops at the end of the procedure is equal to the expected number of loops created after the first tying, plus the expected number of loops created after the second tying, etc. After each tying, the number of non-loop strings decreases by 1, and then the probabilities to create a new loop are 1/19, 1/17, 1/15, etc. Therefore, the answer is the sum 1/19 + 1/17 + 1/15 + … + 1/3 + 1/1 ~ 2.1.

## Versatile Word

What four-letter word can be written forward, backward or upside down, and can still be read from left to right?

The word NOON.

## Green House

There was a green house. Inside the green house there was a white house. Inside the white house there was a red house. Inside the red house there were lots of babies. What is it?