Consider, for example, an ancient galley ship with many oarsmen providing an engine. This wasn’t a great use of human power. An oarsman on a galley used his arms and back but didn’t much use ...

The use of propellers for extracting power from the wind provided early civilizations with an important alternative to human or animal based stationary power sources. The photograph shows a windmill ...

A galaxy far, far away may be closer than you think. NVIDIA CEO Jensen Huang is making sure of it, thanks to a collab with Disney Research.

Crank diameter and wheel size must also be taken into account in matching the human power source to the machine. In boat and airplane applications of the gear and chain system it is usually adequate ...