Common structural elements in buildings around the globe, domes were first constructed atop primitive huts using sticks and mud. Their full architectural potential was not realized, however, until the 6th-century Byzantine architects of Constantinople's Hagia Sophia perfected the use of pendentivesâ€”triangular sections of vaulting that form the transition between circular domes and their polygonal supporting structures. Not all domes are perfectly circular. When was the first oval dome built?
Back in the day
Lindh was a Swedish Social Democrat and an important proponent of the European Union. She was the Chairman of the Council of the European Union in 2001, and, at the time of her murder, a prime candidate to become the next president of the Social Democrats and prime minister of Sweden. She was attacked just prior to a Swedish referendum on the Euro, while intensely involved in a public campaign for the approval of the currency. In her youth, Lindh protested against what war?
Born on a day like today
Yokoi was one of the most important figures in the history of the Nintendo video game company. While employed there, Yokoi designed the Game Boy handheld game console and improved the D-Pad, the cross-shaped multi-directional input device found on most modern control pads. He also helped produce many popular arcade games, including the original Mario Bros. and Donkey Kong. What simple product, developed by Yokoi for his own amusement, sold 1.2 million units and launched his career?