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Physics for Entertainment

Published in 1913, a best-seller in the 1930s and long out of print, Physics for Entertainment was translated from Russian into many languages and influenced science students around the world. Among them was Grigori Yakovlevich Perelman, the Russian mathematician (unrelated to the author), who solved the Poincaré conjecture, and who was awarded and rejected the Fields Medal. Grigori's father, an electrical engineer, gave him Physics for Entertainment to encourage his son's interest in mathematics. In the foreword, the book’s author describes the contents as “conundrums, brain-teasers, entertaining anecdotes, and unexpected comparisons,” adding, “I have quoted extensively from Jules Verne, H. G. Wells, Mark Twain and other writers, because, besides providing entertainment, the fantastic experiments these writers describe may well serve as instructive illustrations at physics classes.” The book’s topics included how to jump from a moving car, and why, “according to the law of buoyancy, we would never drown in the Dead Sea.”

Villa Oliva

The building was commissioned by the Buonvisi family at the end of the 15th century and built by Matteo Civitali (1436-1501). A legend reports of a bet between a Buonvisi and the King of France Louis XIV. The Buonvisi claimed that his stable was more beautiful than any of the rooms of Versailles. The French Ambassador to the Republic of Lucca was sent by the king to visit the Buonvisi stable and verify that claim. Before the visit Buonvisi had ordered the entire stable to be covered with French gold coins showing the effigy of Louis XIV. The ambassador had to confirm the claim back to Paris and Buonvisi won his bet.

Grotta dello Smeraldo

The Grotta dello Smeraldo is a sea cave that is flooded with a brilliant blue or emerald light. The quality and nature of the color in each cave is determined by the unique lighting conditions in that particular cave. The grotto, which is located along Italy’s Amalfi Coast, is partly filled with water. The surface area of the water measures roughly 45 x 32 meters, with a cavern roof about 24 meters above water level. Unlike the more famous Blue Grotto a few miles to the west on Capri, the Grotta dello Smeraldo has no natural outlet above the waterline. The only opening to the outside world is just below the water level. Refracted sunlight entering the cavern through the opening gives the water its characteristic emerald glow during daylight hours.