: Explains how the first atoms (mostly hydrogen and helium) formed in the first few minutes of the universe.
: Recent studies on human ancestry reveal that modern humans interbred with other hominins, such as Neanderthals and Denisovans. 4. The Origin of Civilization
The transition from nomadic lifestyles to settled societies marked a major shift in human history roughly .
: Suggests that self-replicating RNA molecules preceded DNA and proteins as the first genetic material.