How can you tell a raw egg from a hard-boiled egg?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

What occurs twice in a week, once in a year but never in a day?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

What does below pictogram mean?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

What word does this rebus represent?

meta meta
meta meta

The host of a game show offers the guest a choice of three doors. Behind one is an expensive car, but behind the other two are goats.
After you have chosen one door, he reveals one of the other two doors behind which is a goat (he wouldn't reveal a car).

Now he gives you the chance to switch to the other unrevealed door or stay at your initial choice. You will then get what is behind that door.

You cannot hear the goats from behind the doors, or in any way know which door has the prize.

Should you stay, or switch, or doesn't it matter?