Quote by Elizabeth Kolbert : “Walter Alvarez dubbed the formation”

Walter [Alvarez] dubbed the formation the “Crater of Doom.” It became more widely known, after the nearest town, as the Chicxulub crater. – Elizabeth Kolbert

Quote by Elizabeth Kolbert : “One theory has it that”

One theory has it that Bd was moved around the globe with shipments of African clawed frogs, which were used in the nineteen-fifties and sixties in pregnancy tests. (Female African clawed frogs, when injected with the urine of a pregnant woman, lay eggs within a few hours.) – Elizabeth Kolbert