What is always in front of you but can’t be seen?

You are playing as white and given four rooks to checkmate the black king in four moves with the following rules 1. You can place one rook every move and ensure the black king should be in check position.2. After four moves the black king should be in the checkmate position.

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

Kids with the most attentive eyes can spot a different watermelon in 4 seconds. Can you? Test your eyes now!

The answer I give is yes, but what I mean is no. What was the question?

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

A woman lives in a skyscraper thirty-six floors high and is served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?