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.
Cyrus McCormick's reaper was five times more efficient than hand harvesting wheat, but at first farmers looked upon the invention as a novelty. In 1837, John Deere made the first commercially successful riding plow. Deere's steel plow allowed farmers to turn heavy, gummy prairie sod easily, which stuck to the older wooden and iron plows. His inventions made farm much less physically demanding.