The increase in life expectancy during the 20th century is largely due to improvements in child survival; this increase is associated with reductions in infectious disease mortality, due largely to immunization.1 However, infectious diseases remain a major cause of illness, disability, and death.
The First Mowers. The lawn mower was invented in 1830 by Edwin Beard Budding, an engineer from Stroud, Gloucestershire, England. He obtained the idea after seeing a machine in a local cloth mill which used a cutting cylinder (or bladed reel) mounted on a bench to trim cloth to make a smooth finish after weaving.
John Deere was an Illinois blacksmith and manufacturer. Early in his career, Deere and an associate designed a series of farm plows. In 1837, on his own, John Deere designed the first cast steel plow that greatly assisted the Great Plains farmers. The large plows made for cutting the tough prairie ground were called grasshopper plows. The plow was made of wrought iron and had a steel share that could cut through sticky soil without clogging.