"20th-Century Technology" surveys major innovations from 1901 to 2000 and explains how they reshaped daily life, industry, communication, medicine, and science. The video highlights mass production and the assembly line, early aviation, radio and television, penicillin and antibiotics, nuclear fission and atomic energy, space exploration, genetics and biotechnology, and the rise of personal computing and the Internet. Key figures include Henry Ford, the Wright brothers, Alexander Fleming, Watson and Crick, Yuri Gagarin, Neil Armstrong, and Tim Berners-Lee. Using a historical timeline, the lesson builds vocabulary and background knowledge in social studies, science, engineering, and technology while supporting curriculum topics related to inventions, world history, communication systems, and scientific discovery.