Find your sea legs—and your inner geologist—during one of our daytime sails aboard the schooner Mystic Whaler, departing from Brooklyn Bridge Park’s Pier 5 at 3:00 p.m. On board, geophysicist Frank Nitsche and education coordinator Margie Turrin, both of Columbia University’s Lamont-Doherty Earth Observatory, will unveil the underwater history of the Hudson, discuss how we map the ocean depths and trace ice flows, and explain how the moon controls the tides. Raise the sails, cast off, and join the World Science Festival for a stunningly beautiful, deeply informative tour of New York Harbor you’ll never forget.