>we're at or past the midpoint, half or more of all the possible potential-life-forming-events in our galaxy have already occurred Caveat: for life that resemb

>we're at or past the midpoint, half or more of all the possible potential-life-forming-events in our galaxy have already occurred Caveat: for life that resembles life on Earth. Admittedly that's the only kind of life we're certain exists, but more or less alien forms of life seem to be at least theoretically possible. (Which gets into whether we'd even recognize each other as life.)