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 was the key discovery about atoms made in the 1930s?

• Atoms have a nucleus made of protons.

• Atoms are indivisible.

• Atoms contain negatively charged electrons.

• Atoms contain uncharged particles called neutrons.

Who were the scientists that contributed to the discovery of DNA's double helix structure?

• Marie Curie and Louis Pasteur

• Isaac Newton and Galileo Galilei

• Rosalind Franklin and Maurice Wilkins

• Albert Einstein and Niels Bohr

What vitamin was discovered to prevent scurvy?

• Vitamin D

• Vitamin B

• Vitamin A

• Vitamin C

Which scientist is credited with the discovery of penicillin?

• Marie Curie

• Gregor Mendel

• Louis Pasteur

• Alexander Fleming

What did Edwin Hubble discover about the universe?

• The universe is shrinking.

• The universe is expanding and contains many galaxies.

• The universe is contained within the Milky Way.

• The universe is made entirely of dark matter.

What theory suggests that modern humans originated from Africa?

• Pangaea theory

• Multiregional hypothesis

• Continental drift theory

• Out of Africa theory

What environmental issue is caused by CFCs?

• Global warming

• Ozone layer depletion

• Acid rain

• Deforestation