What can you see in the middle of March and April that you can never see in any other month?

A man dies of old age on his 25 birthday. How is this possible?

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

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

In a secret society, a buried chamber can be accessed only via a secret password. The password is seven characters long and comprises of just letters and numbers.

You find a code that can help you in cracking the password. The code says "You force heaven to be empty".

Can you deduce the password from that?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

Which wheel of car does not rotate when you turn your car right?