Science and theory in the early 20th century?.
1907, 1943, 1967, 1988, 1992
Infectious disease was the leading cause of death prior to the 20th century !:]
the most important invention was the plow
Albert Einstein
The locomotive
The Steamboat
Radio was not an important invention in the early 20th century. Instead it was developed by Heinrich Hertz in the 18th century. The cotton gin (APEX)
The Steamboat
The Steamboat
The Steamboat
Radio was not an important invention in the early 20th century. Instead it was developed by Heinrich Hertz in the 18th century. The cotton gin (APEX)
The locomotive
The cotton gin
the cotton gin
The cotton gin
the locomotive