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Looks at farming around the world and at the global problem of providing food for all of the people without destroying the planet.

Explains estimation, standard measures, measuring tools, scale drawing and perspective. Features activities involving measurement and estimation for readers to try. Suggested level: primary.

Learn the secrets the professionals have been guarding for centuries! Baffleyour audience with card tricks, rope tricks, dice tricks, and much, much more. With step-by-step, illustrated instructions and materials, Magic makes amazing tricks as easyas saying, "abracadabra!" This kit features: i 1 full-color deck of cards i 1 magic rope i 3 dice i 1 magic ring i 1 magic changing paddle i 98 color stickers i 1 cut-out magic die i 1 cut-out Chinese compass i 1 silken handkerchif i 1 presto magic wand i 1 ribbon i rubber bands

Presents experiments demonstrating such aspects of light as shadows, reflection, refraction, lenses, optical illusions, and color.

Presents experiments demonstrating such aspects of light as shadows, reflection, refraction, lenses, optical illusions, and color.

Presents experiments and tricks to demonstrate movements representing natural forces such as gravity, inertia, and friction, and those made by simple machines.