Its detection at unearthly levels in rocks 65 million years old was the first evidence in the case for an asteroid causing the mass extinction and global environmental mayhem that ended the Cretaceous period and began the Tertiary period.

BBC: Leaving our mark: Fossils of the future

Enrolment in pre-primary, secondary and tertiary education has also grown by more than 60% during the same period.

UNESCO: EDUCATION