The 1920s saw inventions like the handheld hair dryer in 1920, penicillin in 1928, the television in 1924 and the electric razor in 1927. The 1920s was a time of many inventions and brand new technology.
One of the most popular and useful inventions to come out of the '20s was the radio. It didn't take long for radios to show up in many peoples' homes, and the radio gave folks an affordable way to be entertained and stay up to date with current events. The radio became so popular that by 1927, President Coolidge signed the Radio Control Bill which regulated the airwaves and classified radio stations to prevent overlapping and interference.
Another life-changing invention of the 1920s was the television. In 1927, the president of AT&T made a "video call" to President Herbert Hoover, who, at the time, was more than 200 miles away. Television was born but due to events like the Great Depression and World War II, it would be many years before television ownership would be widespread because many people couldn't afford a TV.
The Spanish Flu epidemic that killed millions of people around the world in 1918 spurred new medical inventions in the 1920s. Drugs such as sulfa drugs and vitamins like vitamin E were discovered during the 1920s.