Q: What is the logic for the many meanings of the prefix “in-“? “Inhumane” means “not humane.” But “invaluable” means “exceptionally above value,” and “innumerable” means “too many to count.” — ...

It was an exhilarating moment. Saturday last week, Eliud Kipchoge, a renowned Kenyan athlete, set out to run the 42-kilometre marathon in under two hours. Until then, no human being had been able to ...