10 years ago
An astonishing achievement for creatures, such as we, whose earliest footsteps, 3.5 million years old, are preserved in the volcanic ash of E. Africa
We humans have set foot on another world in a place called the sea of tranquility. It's an astonishing achievement for creatures, such as we, whose earliest footsteps, 3.5 million years old, are preserved in the volcanic ash of East Africa. -Carl Sagan
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