A tidal bore is an inrush of water with a wavelike front that advances up a river or narrow bay, against the current, with considerable force and velocity. It is caused by the progress of an incoming tide from a wide-mouthed bay into its narrower portion and occurs in relatively few places in the world. The largest, China's Qiantang River bore, can reach 30 ft (9 m) in height and travel as fast as 25 mph (40 km/h). Although dangerous, bores are sought out by athletes who engage in what sport?
Back in the day
Project Mercury was the first successful manned spaceflight program of the US. It ran from 1959 through 1963 with the goal of putting a man in orbit around the Earth. The first Americans to venture into space were drawn from a group of 110 military pilots chosen for their flight test experience and their satisfaction of certain physical requirements; seven were selected to be astronauts in April 1959 and were quickly dubbed the "Mercury Seven." How many of them went on to fly Mercury missions?
Born on a day like today
Utzon was a Danish architect who, in 1957, won a competition to design Australia's Sydney Opera House, which was completed in 1973 and was declared a World Heritage Site in 2007. Utzon is only the second architect in history to see his work assigned this status during his lifetime. In 1966, after designing the opera house's distinctive roof—a series of glittering white shell-shaped vaults—and spending nearly a decade on the project, Utzon was forced to resign mid-project. Why?