My 1st brother studies aerodynamics, my 2nd builds different engines. My 3rd brother is just an illustration and my fourth is as wise as an owl. About me? I am unanimous to whatever you say! Find us all!

You have an unreliable clock. The clock loses exactly 24 minutes every hour. It is now showing 3:00am and you have set it correctly at midnight. The clock stopped 1 hour ago, what is the correct time now?

To weigh a 40-pound object with four weights – 1, 3, 9, and 27 pounds, the merchant placed all of the weights on one side of the scale and the object on the other side. But how did he weigh 5 pounds?

Can you find a number which added to itself one or several times will give a total having the same digits as that number but differently arranged and after the sixth addition will give a total of all nines?

Thirteen per cent of the people in a certain town have unlisted phone numbers. You select three hundred names at random from the phone book. What is the expected number of people who will have unlisted numbers?

A window cleaner is cleaning the windows on the 25th floor of a skyscraper when, suddenly, he slips and falls. He has no safety equipment and nothing to soften his fall, and yet he is not hurt. How can this be?

Sarah is older than Julie and Maggie. Maggie is older than Paula. Ann is younger than Julie, but older than Paula. Ann is younger than Maggie. Sarah is younger than Liz. Who is the second oldest woman in this group?

Each letter in the below equation stands for a different number, and each time the same letter appears, it is the same number. What is the only set of numbers that makes this equation correct? SEND + MORE = MONEY

A clever thief was brought before a king to receive his punishment. The king, feeling merciful, asked the thief how he would like to die. The thief told him, and the king let him go. What did the thief tell the king?

There are eight pills. They are all the same size and color. One pill weighs slightly more than the others and it is poisonous. You have a balanced scale and can only use it twice. How can you find the poisoned pill?

You have 8 identical-looking coins. One of these coins is counterfeit and is known to be lighter than the others. You also have a two-pan balance scale. How can you identify the fake coin by using the scale only twice?

A man walks into a bar and asks the bartender for a glass of water. The bartender pulls out a shotgun, points it at the man, and cocks it. The man pauses, before saying “Thank you” and leaves. What happened?

Which country has been hidden in the paragraph below: The local habitat around a railway track can be very interesting. For example, supporting the track is a sleeper, under which you can find the lesser spotted great weevil.

When James was nine years old he hammered a nail into a tree to mark his height. Ten years later, James returned to see how much higher the nail was. If the tree grew by four inches each year, how much higher would the nail be?

You need to boil eggs for exactly 9 minutes. But you have only 2 hourglasses – one measures 4 minutes and the other measures 7 minutes. How do you measure exactly 9 minutes without the process taking longer than 9 minutes?.