Large electromagnets can lift heavy loads. This one picks up and stacks big blocks of crushed iron and steel in a junkyard. Electricity can make light and heat. It can also make a magnet---one that...
A force that pushes and pulls
Magnets can do strange things---that's what makes them such fun to play with. They can stick to each other. They can make nails or pins hang on to each other, like people holding hands. They can even...
Which way?
Which way are you going? A compass can tell you. A compass is a box with a magnetic pointer or needle that turns. The marked end of the needle always points north. Why? Because it is pulled by a...