The Compass
Before the GPS app in our phones and cars, people found their direction using a compass - a magnetizes needle lined up with the earth's magnetic field to point at the true North.
The first compass was believed to be invented in China during the Han Dynasty and was originally used for divination, fortune-telling, and geomancy. Today, hand-held magnetic compasses are still used in sailing, mining, astronomy and in the military.
Build your own Compass!