Ethel  WHITELOCK

 1901 - King Camp Gillette and William Emery Nickerson invented the world's first disposable razor blade in 1901. (Boston, Massachusetts, USA)

 1902 - July 17 - Willis Haviland Carrier designed the first modern air-conditioning system. (Buffalo, New York, USA)

 1903 - The first engine-powered airplane is invented (Wilbur & Orville Wright, United States)

 1906 - August 22 – The first Victor Victrola, a phonographic record player, was manufactured, revolutionizing the way people listened to music at home.

 In 1906, Reginald Fessenden made the first AM radio broadcast on December 24th. This event marked a significant advancement in radio technology, paving the way for the modern broadcasting industry.

 1907-1908 - The electric washing machine is invented (Alva J. Fisher, United States)

 1908 - First Model-T car is produced by Henry Ford (United States)

 1913 - The assembly line is invented (Henry Ford, United States)

The bra is invented (Mary Phelps Jacob, United States)

 1921 - Charles Strite of Minnesota patents the pop-up toaster.

 1923 to 1927 - Television is invented (Vladimir Kosma Zworykin (Russia), Philo Taylor Farnsworth (United States))

 1927 - The aerosol can is invented (Erik Rotheim, Norway)

 1928 - Sliced bread (bread slicing machine) is invented by Otto Frederick Rohwedder (United States)

 1930 - Scotch tape is invented (Richard Drew (3M), United States)

 In 1930, on February 18, Pluto was discovered by astronomer Clyde Tombaugh at the Lowell Observatory in Flagstaff, Arizona, marking a significant milestone in the study of our solar system.

 1931 - The paper towel is invented (Arthur Scott, United States)

 1934 - The metal beverage can is invented (American Can Co., United States)

 1935 - The snowmobile was invented by Joseph Bombardier (Quebec, Canada)

 1938 - The ballpoint pen is invented (Lazlo Biro, Hungary)

 1938-1944 - Sunscreen is invented (Franz Greiter, Switzerland and Benjamin Green, United States)

 1938 - October 27 - Du Pont announces a name for its new synthetic yarn: nylon.

 1940 - April - 1st electron microscope demonstrated (RCA), Philadelphia, Pennsylvania, USA

 1945 - The atomic bomb is invented (J. Robert Oppenheimer, et al., United States)

 The microwave oven was invented accidentally in 1945 by Percy Spencer, a Raytheon engineer. While testing a magnetron, he noticed microwaves melted a candy bar in his pocket. Experimenting further, he discovered microwaves could cook food quickly. Raytheon patented the process, and by 1947, they built the first commercial microwave oven, called the 'Radarange.' Initially used in commercial settings, microwaves becomes affordable for home use by the 1960s and 1970s, revolutionizing cooking.

 1948 - Velcro is invented (George de Mestral, Switzerland)