Discoveries
1901	Marconi receives radio signal over Atlantic
1903	Wright brothers fly first motorized plane
1913	Ford installs first moving assembly line
1920	KDKA begins to broadcast
1920	Electric consumer appliances proliferate
1926	Television is developed
1935	Nylon is invented
1945	ENIAC is built
1947	Transistor is invented
1962	"Silent Spring" is published
1969	Apollo astronauts land on the Moon
1971	First commercial microprocessor is introduced
1975	Personal computer industry is launched
1992	The Internet gives rise to the World Wide Web