10 Things We Didn't Know 100 Years Ago

The video explores ten major scientific discoveries of the 20th century, including the identification of neutrons, the structure of DNA, the role of vitamins, the development of antibiotics, the vastness of the universe, the abundance of hydrogen, tectonic plate theory, human origins in Africa, the impact of CFCs on the ozone layer, and the validation of Einstein's theories. These discoveries have significantly advanced our understanding of the world and the universe.

What evidence did Edwin Hubble provide to support the idea that the universe is much larger than the Milky Way?

What was the theory of continental drift proposed by Alfred Wegener?

How did scientists come to understand the impact of CFCs on the ozone layer?