Flip a switch, push a button, or turn a knob. The world as we know it runs on power.
Electricity lights our homes and charges our phone and tablet batteries. Motors power our cars, our lawn mowers, and even airplanes. Inventions in the late 19th and early 20th centuries made these things possible. The new century was off to a powerful start, and machines kept improving from there. Take a look at where some familiar machines got their start.