How well do you know Madonna? Do you consider Tiger Woods a buddy? What about former South African President Nelson Mandela?
According to the "small world" theory, you should be just six handshakes away from each of them. But can anyone in the world really reach anyone else through a chain of just six friends?
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For centuries, mathematicians have tried to find a simple formula to describe where prime numbers (Prime numbers: which are divisible only by one and themselves) fall along the number line.It's one of the seven outstanding mathematical mysteries.
German mathematician Bernhard Riemann tried to unlock the pattern, but he couldn't verify it. Many great minds have become obsessed with proving his guess, referred to as the Riemann Hypothesis (RH), ever since.
Read more about RH and the books published recently at Math's Most Wanted
Prime Obsession: Bernhard Riemann & the Greatest Unsolved Problem by John Derbyshire
The Riemann Hypothesis: The Greatest Unsolved Problem in Mathematics by Karl Sabbagh
The Music of the Primes : Searching to Solve the Greatest Mystery in Mathematics by Marcus du Sautoy