Science returns to the Middle Ages with a vengeance
Touring Britain's Cotswolds region in Gloucestershire, England, and beyond can be downright inspirational.  Castles long ago conquered, now in ruins, recall a cold, hard past — a past that relied on the sun and wood for heat, coupled with wind and water for power.  And mostly only feudal lords and royal gentry could comfortably afford even paltry luxuries on a regular basis.