To understand how aliens might think, Dominic Sivitilli went to the bottom of the sea to find the closest thing: an octopus. Its sophisticated nervous systems and sensitive suckers allow it to do incredible things like escape aquariums — but Sivitilli is learning how each of an octopus' eight arms might actually have a mind of its own. We don’t know yet if alien life exists. But if they do, they might think like an octopus.