My naughty little sister causes mischief wherever she goes. If she is left with Bad Harry they make a mess with a lovely sponge trifle. She won't even make friends with Father Christmas but having a wobbly tooth probably doesn't help - when will it ever come out?

My naughty little sister is always getting in trouble. This time she refuses to have her photo taken and shows off in front of Harry. Will she ever learn to be good? Ages 7+.

More misadventures of the narrator's rambunctious little sister with her family and friends.

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Why is a spiral staircase easier to climb? How can a screw lift a heavy car? What is a propeller for? Screws have been sued for over 2,000 years as a simple machine that can make other machines work. When you turn a faucet on or off, ride on an airplane, or open a soda bottle you are using screws. This book explains what screws are and how they help you do everyday things.