If aliens exist, here's what they most likely look like

Movies, TV shows, and video games have helped humanity paint a mental picture of what aliens might look like if we ever run into them, but most of the time those fictional depictions have little or no scientific backing whatsoever. Researchers searching for extraterrestrial life don't necessarily know exactly what they're looking for, but based on what we've learned about humanity's rise there's a handful of things nature tells us are required for advancement of a civilization. In the book "The ...