The clepsydra, or water clock, is an ancient timekeeper that operates by measuring the regulated flow of liquid into or out of a vessel. It is believed to have been used in Egypt as early as 2,000 BCE, making it one of the earliest known time-measurement devices. Early water clocks were calibrated with a sundial, and they remained the most accurate timekeeping devices until the invention of the pendulum clock in the 17th century. When did knowing the time become important to the common man?
Back in the day
The Munich massacre occurred at the 1972 Summer Olympics in Munich, Germany, when members of the Israeli Olympic team were taken hostage by members of Black September, a Palestinian terrorist organization. The attack led to the deaths of 11 Israeli athletes, five of the eight kidnappers, and one German police officer. Why has the failed rescue attempt at FÃ¼rstenfeldbruck airbase been called a disaster?
Born on a day like today
Lafayette was a French aristocrat most famous for his participation in the American Revolutionary War and early French Revolution. Considered a national hero in both France and the US, he is one of only six people in history to become an honorary US citizen. Lafayette is also credited with having created the modern French flag in July 1789. He lived in retirement in France during the First Empire, but returned to the US in 1824 to attend the inaugural banquet of what university?