(1) Steel and (2) the Elevator. Those are the most significant.
Henry Ford had the most inventions
I think it is the flushing toilet.
Writing, language, arithmetic, the wheel, fire, cooking, cutting tools, That's a few I think important.
The Chinese inventions have helped in various ways in life. Some of the technologies we enjoy are as a result of the Chinese inventions. Chinese inventions are applicable in most areas of our lives.
Archimedes had several inventions to defend Syracuse, including walls that could shoot arrows. The most famous of these inventions was the Archimedes Claw; a device to lift attacking Roman warships out of the water. No one today has been able to figure out how this device worked.
(1) Steel and (2) the Elevator. Those are the most significant.
Archimedes spended his time in war
Television is a combination of many inventions, but if I had to pick one name as the most significant, it would be Milo Farnsworth.
Most likely, although not for certain, Archimedes' father was an astronomer named Phidias and two of his friends were Conon of Samos and Eratosthenes of Cyrene. My source is linked below.
Archimedes was born in Syracuse, Sicily and probably spent most of his life there.
Henry Ford had the most inventions
The most significant person I can think of, would be: Albert Einstein
Technological innovation was the most significant economic and social development of the early twentieth century. Some of these inventions included the typewriter, telephone, and mechanized office equipment.
The famous scientist of the Hellenistic era was Archimedes.
"Eureka!" (I have found it!) - his shout after discovering of so called Archimedes' Principle.
Eureeka !