Named a Best Book of 2020 by the Telegraph, the Times, and BBC History Magazine, The Light Ages is an illuminating guide to the scientific and technological achievements of the Middle Ages. Cambridge science historian Seb Falk follows the life of a crusading fourteenth-century astronomer-monk, John of Westwyk, to take us on a tour of medieval science--from multiplying Roman numerals to navigating by the stars, curing disease, and telling time with...