Parachute, Selective Breeding, Electrolysis, Mechanical Reaper

Skydiving began in the Russian military in 1930. A parachute is a large cloth shaped like an umbrella. Parachutes slow down your descent to the ground. Parachutes let people and objects to be safely dropped from an airplane. Charles Broadwick build models for the US military.

Robert Bakewell was born in 1725. Selective breeding is the process of choosing only plants and animals with desirable characteristics to reproduce. The eating habits of people changed. Bakewell sold his animals at a market.

Electrolysis breaks compounds into elements. Humphrey's assistant, Faraday, played a major roll in developing modern electoral theory. Rocket fuel is produced using electrolysis. 

Wheat was a fundamental crop in the 17th century. Harvesting requires reaping, threshing, and winnowing. Meikle invented the threshing machine. Harvesting wheat faster was important because the population grew 700% from 1700 to 1900.