Plus octopi, which evolved some degree of intelligence in a very different way than vertebrates. So we have at least three paths to intelligence now. This is a

Plus octopi, which evolved some degree of intelligence in a very different way than vertebrates. So we have at least three paths to intelligence now. This is an indication that fᵢ in the Drake Equation [1] is probably closer to 1 than 0. [1] https://en.wikipedia.org/wiki/Drake_equation https://en.wikipedia.org/wiki/Drake_equation