Petros Papachristos devotes the early part of his life trying to prove one of the greatest mathematical challenges of all time: Goldbach's Conjecture, the deceptively simple claim that every even number greater than two is the sum of two primes. Against a tableau of famous historical figures-among them G.H. Hardy, the self-taught Indian genius Srinivasa Ramanujan, and a young Kurt Godel-Petros …
We know we all need to eat, but why do we need to and where does it go? Filled with photos and clear diagrams, follow the food you eat on its journey through your body and find out what happens to it along the way.
Take the ride of your life through the Solar System with children's artist Simon Abbott. Discover all the incredible planets and more with our intrepid astronauts and spectacular pioneering spacecraft. With space words, fun facts and dazzling cartoon illustrations, this is an entertaining introduction to the Solar System for Kids.