If Earth’s entire 4.5 billion-year history was squeezed into a single, 24-hour day, when would modern humans arrive? “CBS Evening News” co-anchor John Dickerson ponders the meaning of Earth Day.
If Earth’s entire 4.5 billion-year history was squeezed into a single, 24-hour day, when would modern humans arrive? “CBS Evening News” co-anchor John Dickerson ponders the meaning of Earth Day.