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These inventions changed the world - learn all about them in just 30 seconds!From the first flushing toilet to futuristic robots, Inventions in 30 Seconds explains how key inventions revolutionized the world. Delivered in an energetic, informative style, children will gain a better understanding of how everyday life has been shaped by great inventions. The 30 Seconds series takes readers on a journey of discovery through a wide range of fascinating subjects. Each topic is presented as a quick 30-second soundbite, supported by flash summaries and full-color artwork. Fun, interactive missions with things to make or do support the topics, encouraging readers to test, explore, and discover even more.