n Edible diamonds? Yes, sort of. The word “carat,” as a measure of gold purity, is derived from the Greek word for carob seeds, which were used to weigh small quantities in ancient times. That old measure was equivalent to one twenty-fourth of a Roman gold coin, which explains both why the term came to be applied to gold, and why pure gold is 24-carat.

Considering the most direct line of descent, how many generations of British royals separate Queen Elizabeth II and William the Conqueror, who claimed the English crown in 1066?

A) 30

B) 50

C) 70

D) 90

Answer Monday.

Thursday’s answer: Brazil accounts for about one-third of the world’s production of coffee.