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There were many great inventors during the 20th century and Jonas Salk was one of the most important inventors. He was ranked highest because he caused a deadly disease to become one that is rare. The Wright Brothers came second because they eventually lead to space exploration which has a great effect on the planet today. Charles Drew came third with blood banks because blood banks allow doctors to not have to draw blood at the time that they need it and allows them to have plenty of excess blood in case of emergency's, saving countless lives. Henry Ford was fourth on the list because transportation was made easier and more affordable, while his assembly lines also lead to be re-modified to help build army supplies during the world wars. Thomas Edison came last with the light bulb because although the light bulb is very important and it is used in daily life, it does not directly save lives and there are alternative to light bulbs such as candles.

I wasn't able to upload pictures of what I wanted to because it needed premium for that so there is a link to the pictures next to these photos

Advances In The 20th Century

Charles Drew

Blood Banks

Drew's creation of blood banks allowed blood to be stored. Doctors were able to save more lives and gather more blood.

Henry Ford

Affordable auto-mobile

With Ford's assembly line, cars were created quicker and cheaper. People were now able to live outside of the city and drive in to town for work.

Thomas Edison

Light Bulb

Light bulbs allowed people to work longer. They no longer had to stop working once the sun went down or use candles and risk a fire.

Jonas Salk

Polio Vaccine

Polio went from a common deadly disease to a rare one. Salk refused to patent his vaccine because he wanted everyone to be able to get it and save countless lives through it.

Wright Brothers

Aviation

Aviation allowed for easier and quicker modes of transportation. It eventually lead to space travel merely about 50 years later.