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Max Knoll and Ernst Ruska invented the electron microscope in 1931 and proved that using electron beams could reveal images of matter. It allowed people to explain with picture proof what everything in the world was made of.

Max Knoll and Ernst Ruska invented the electron microscope in 1931 and proved that using electron beams could reveal images of matter. It allowed people to explain with picture proof what everything in the world was made of.

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ELECTRON MICROSCOPE    Max Knoll and Ernst Ruska invented the electron microscope in 1931 and proved that using electron beams could reveal images of matter. It allowed people to explain with picture proof what everything in the world was made of.

ELECTRON MICROSCOPE Max Knoll and Ernst Ruska invented the electron microscope in 1931 and proved that using electron beams could reveal images of matter. It allowed people to explain with picture proof what everything in the world was made of.

A penniless mother hides her face in shame after putting her children up for sale, Chicago, 1948

A penniless mother hides her face in shame after putting her children up for sale, Chicago, 1948

In the late 1850's, Oliver Wendell Holmes invented a handheld stereoscope, which really took off in America. Paper card stereo views were produced from the early 1850's until the 1930's. Through the years, stereo views were made in almost every medium known to photography. Millions of different views were created throughout the world during the Victorian era.

In the late 1850's, Oliver Wendell Holmes invented a handheld stereoscope, which really took off in America. Paper card stereo views were produced from the early 1850's until the 1930's. Through the years, stereo views were made in almost every medium known to photography. Millions of different views were created throughout the world during the Victorian era.

1930s hair dryer or memory diverter. Today the hair dryer is handheld. You used to have to put your head under a machine to dry your hair. It has greatly changed over the years. It was very helpful to people back then though.

1930s hair dryer or memory diverter. Today the hair dryer is handheld. You used to have to put your head under a machine to dry your hair. It has greatly changed over the years. It was very helpful to people back then though.

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