10 Things We Didn't Know 100 Years Ago

In just the last century, we've made an astounding amount of scientific progress. And thanks to some of that progress, we can now share 10 of those discoveries with you in a video on the internet!
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Sources:
General

Discovery of the neutron


DNA as a double helix

Vitamins


Antibiotics


Milky Way


Hydrogen


Plate Tectonics


Out of Africa Theory

Ozone

Einstein