When was the webcam invented and why？ Do imaginary numbers exist？ What is fuzzy logic？ Find the answers these questions about the amazing world of numbers， computers and coding， along with loads of other curious， amazing and mind-boggling facts， in this eye-catching book that is absolutely bursting with information。 Covers a wide range of topics from Ancient counting systems to unsolved mathematical mysteries and the latest in wearable computer technology， including all kinds of things you won’t find in an ordinary text book。 With bold illustrations， picture maps and infographics， and clear， comprehensible text， children can pore over the information that they’ll delight in sharing with family and friends。 Also includes links to specially selected websites with further information， games and video clips。 Part of the popular '100 Things to Know' series， ideal gifts for fact-hungry children。