Riddles paradoxes & conundrums have been confusing & confounding people since at least the time of the Ancient Greeks. The eponymous riddle according to legend was devised by Albert Einstein as a child. He claimed that only about 2% of the population would be able to work out the correct answer. There are no tricks & there is only one answer. It requires the cool application of logic to solve. & a lot of patience. Einsteins Riddle features fifty of the toughest logic problems lateral thinking puzzles & tests of mental agility. By turns entertaining & infuriating the puzzles challenge our preconceptions tell us about how we reason & provide a rigorous intellectual workout.