It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

How can a man go eight days without sleep?

What is the relationship between these matchstick pictures below?

What do the following words have in common?

Assess
Banana
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

Can you find the odd number in the following?

2716, 4135, 5321 and 7145

What has one eye, but can’t see?

John replied, when asked how old he was. In 2 years he will be twice as old as he was five years ago.' How old is he ?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

A number with an interesting property:

When I divide it by 2, the remainder is 1.
When I divide it by 3, the remainder is 2.
When I divide it by 4, the remainder is 3.
When I divide it by 5, the remainder is 4.
When I divide it by 6, the remainder is 5.
When I divide it by 7, the remainder is 6.
When I divide it by 8, the remainder is 7.
When I divide it by 9, the remainder is 8.
When I divide it by 10, the remainder is 9.

It's not a small number, but it's not really big, either.
When I looked for a smaller number with this property I couldn't find one.

Can you find it?

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