Revolutionary inventions from the 1920s, including medical breakthroughs like insulin and everyday innovations like Band-Aids, sliced bread, and the polygraph.

All inventions cause the world to react in one way or another. In many cases, discoveries push the boundaries of human output ...

Discover how manure, wood ash, and modern NPK fertilizer transformed American agriculture long before tractors and steam engines.

An underwater ship -- A siphon for raising water -- Lifting weights by water, and a portable siphon -- Construction of sluices to raise ships to any height -- A machine worked by fire which can throw ...

"I wanted to create a mechanical lift device for arborists to ensure a fallen tree lands precisely where needed," said an inventor, from Henderson, Ky., "so I invented the MECHANICAL WEDGE. My design ...