Hello, in 1951 a young historian of science named Derek Price was examining a medieval manuscript in the library of Peterhouse College in Cambridge. When the pages of parchment were unbound from their 19th century binding, to his delight he saw the name “Chaucer”. But this was not a manuscript copy of the Canterbury Tales, or even a letter, but an instruction manual for a scientific instrument.

In the end, as my guest Sebastian Falk explains, the manuscript turns out to have been authored not by Geoffrey Chaucer, but an obscure Benedictine monk named John of Westwyk. John’s life, and his scientific interests, affords us a window into the fascinating world of medieval European science, which Falk takes full advantage of in his new book The Light Ages: The Surprising Story of Medieval Science. Using the few scraps of information about John that remain, Falk fills out at the rich context of medieval scientific investigation, from the colleges of Oxford, to John's own monastery of St. Alban's, and even to his participation in a crusade to (of all places) Flanders.

Seb Falk is not only a historian of medieval science and qualified teacher, but at various times in his life a civil servant, lecturer, museum curator, yachmaster, marathon runner, mountaineer, and a Special Constable.