Origins -

: Recent studies on human ancestry reveal that modern humans interbred with other hominins, such as Neanderthals and Denisovans. 4. The Origin of Civilization

: Suggests that self-replicating RNA molecules preceded DNA and proteins as the first genetic material. Origins

The transition from nomadic lifestyles to settled societies marked a major shift in human history roughly . : Recent studies on human ancestry reveal that

: Explains how the first atoms (mostly hydrogen and helium) formed in the first few minutes of the universe. Origins

: Proposes that the universe expanded from an extremely hot, dense state.