TIL about the obsolete scientific theory of Racial Senescence, that species would “grow old” like individuals, and supposed signs of “evolutionary old age” signaling imminent extinction were increasing size and more horns or spikes on the body. This was thought to be how the dinosaurs died out.

TIL about the obsolete scientific theory of Racial Senescence, that species would “grow old” like individuals, and supposed signs of “evolutionary old age” signaling imminent extinction were increasing size and more horns or spikes on the body. This was thought to be how the dinosaurs died out.