I’m no palaeontologist, but being the father of a 7-year-old boy, I talk about dinosaurs more than the average human. My son doesn’t necessarily have that of a great interest in our prehistoric friends themselves, but his thirst for knowledge about the circumstances of their disappearance is seemingly insatiable.
Those father-son discussions about the extinction of dinosaurs led me down a Wikipedia rabbit hole only to discover the existence of such a thing as the Cretaceous–Paleogene boundary. This boundary is a line of dark dust with high concentrations of iridium, which, according to the leading hypothesis, came from the . . . [more]