The optical illusion challenge for the day needs people to put on their thinking caps to find the correct answer. All you get to witness here are two lines and a simple question: Which line is longer?

An optical illusion created by Lesha Porche. One of the most interesting things about social media is the rise of riddles and puzzles. They get people perplexed, bewildered, baffled and yet hooked to ...

The Straight Line Euclid's definition of it is worthless, but his axioms remain basically sound. His successors in mathematics have extended his ideas to the curved line and a clearer concept of ...