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...
The Iron Age mineral
Safety pins and skyscrapers, scissors and steamships, automobiles and airplanes---none of these things could be made without the mineral called iron. Iron is a metal, like copper and tin and bronze....