Books with author Hans Jurgen

Rear cover notes: "Join the Black Hand Gang of super detectives! Find the missing clues to baffling mysteries - right at the scene of the crime! As you read each mystery, you'll come across pictures containing important clues. Study them to find out what's behind The Locked Door or who was in The Mysterious House or why The Lady Lied. (Answers on the back of the pictures.) There are 60 great mysteries in all. See if you can beat the Black Hand Gang detectives at their own game! This is a really different mystery-puzzle book - for an hour's or an evening's sleuthing fun." Includes: "The Mysterious House," "The Treasure in Breezy Lake," "The Smugglers' Tunnel," and "A Theft at the Zoo."

This is the perfect book for the young person who wants to know how things work, and why they work: more than 200 simple experiments that are not only entertaining but educational. As the experimenter learns to light a fire with ice, to crate rain indoors, to use a wrist watch as a compass, he also learns about astronomy, botany, chemistry, physics; he is gently introduced to the principles of electricity and magnetism, heat, light, sound, gravity, momentum and inertia, and even the human senses. Each project is illustrated and includes clear instructions and explanations of cause and effect. Each is safe and easy to do, and the only equipment and mùaterials necessary are simple tools and ordinary household articles. Children of all ages -- and their parents too -- will find that this book both stimulates and satisfies their curiosity.