Answer:
Printing press
Compass
Paper currency
Steel
Electric light
Domestication of horses.
Transitors
Magnifying lens
Telegraph
Atibiotics
Steam engine
Step-by-step explanation:
The 20th Century
Technology from 1900 to 1945
Recent history is notoriously difficult to write, because of the mass of material and the problem of distinguishing the significant from the insignificant among events that have virtually the power of contemporary experience. In respect to the recent history of technology, however, one fact stands out clearly: despite the immense achievements of technology by 1900, the following decades witnessed more advance over a wide range of activities than the whole of previously recorded history. The airplane, the rocket and interplanetary probes, electronics, atomic power, antibiotics, insecticides, and a host of new materials have all been invented and developed to create an unparalleled social situation, full of possibilities and dangers, which would have been virtually unimaginable before the present century.