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

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

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

What is full of holes but still holds water?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

Move four matchsticks to the below square to form three squares?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

What English word has three consecutive double letters?