Cat Flaps and Mousetraps  Harry Oliver

Cat Flaps and Mousetraps Harry Oliver

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Why did Isaac Newton invent the cat flap? How did the first mousetrap come about? Why did it take nearly 20 years to make sliced bread? From the moment the alarm clock wakes us up in the morning until the time we switch the light off at night, we are surrounded by things without which our lives would be impossible: microwaves, televisions, cars, cell phones, and credit card..