Synopsis: Travel through time with the maestros as they explore the amazing history of timekeeping! Did you know that there is more than one calendar? While the most commonly used calendar was on the year 2000, the Jewish calendar said it was the year 5760, while the Muslim calendar said 1420 and the Chinese calendar said 4698. Why do these differences exist? How did ancient civilizations keep track of time? When and how were clocks first invented?…

Synopsis: The greatest discoveries are made outside the classroom! Learn all about mistakes that changed the world with this collection of the strange stories behind everyday inventions! It's no accident that you'll love this book!   SANDWICHES came about when an English earl was too busy gambling to eat his meal and needed to keep one hand free. POTATO CHIPS were first cooked by a chef who was furious when a customer complained that his fried potatoes…