Scientists Revise Famous Drake Equation

[BootinUp]

Assigning values to the seven variables has been an educated guessing game, leading to predictions that such civilizations should be widespread. But if that is true, why is there no conclusive evidence of their existence?

This contradiction is known as the Fermi paradox, named for the Italian and later naturalized American nuclear physicist and Nobelist Dr. Enrico Fermi, who informally posed the question to colleagues.

“Life has been around on Earth for about 4 billion years, but complex organisms like animals didn’t appear until about 600 million years ago, which is not long after the modern episode of plate tectonics began,” Professor Stern said.

“Plate tectonics really jump-starts the evolution machine, and we think we understand why.”

https://www.sci.news/astrobiology-2/revised-drake-equation-13067.html