Why are candle flames yellow? Why does ultraviolet light supposedly kill vampires? What about the monocle? Why was the monocle--a corrective lens that only corrects vision in a single eye--so popular among businessmen and politicians for so many years? Stephen R. Wilk answers all this and so much more in Sandbows and Black Lights. This book is a collection of original essays on weird and unusual topics surrounding optics. Wilk uses the BBC's...