The history of Earth is a rocky and lifeless story. The first signs of life emerged about a billion years after our planet’s creation. They weren’t much either; mostly single-celled organisms that resembled today’s bacteria. Land animals emerged out of the oceans as recent as 500 million years ago, and the genus homo came onto the scene a mere 2.5 million years ago. Complex life on Earth is the new kid on the block; natural selection spent most of its time keeping species the same, not changing them.
We humans are a different story. 200,000 years ago a few tens of thousands of us dotted the African plains. But then something happened. We spread across the globe creating cities and villages along the way. Language evolved, and with it culture and societies. We began living longer and healthier and our population skyrocketed as a result.
What’s peculiar about the rise…
Ver la entrada original 1.050 palabras más