A scotoma is a blind spot or area of depressed vision in the visual field, surrounded by an area of relatively normal vision. There are many types of scotomata, including central scotoma, an area of depressed vision involving the point of fixation and interfering with central vision; peripheral scotoma, an area of depressed vision toward the periphery of the visual field; and scintillating scotoma, an area of diminished vision edged by colored lights. Scintillating scotomata often precede what?
Miguel de Cervantes
Back in the day
The world's first subway line opened in London in 1863. It was 3.75 mi (6 km) long and soon carried tens of thousands of passengers each day—transporting 9.5 million in its first year. Initially steam-powered, the system first electrified some of its lines in 1890. By 1896, it was fully electrified. Today, the London Underground system is one of the largest in the world, with 256 mi (410 km) of track and 270 stations. What is the record for visiting them all in the shortest amount of time?
Born on a day like today
A high school dropout, Foreman learned to box in the Job Corps. He won the Olympic heavyweight gold medal in 1968 and beat Joe Frazier for the world heavyweight crown in 1973. He won all 40 of his professional bouts—many by knockout—before losing to Muhammad Ali in the "Rumble in the Jungle." He retired to be a minister in 1977 but launched a comeback in 1987 and became the world's oldest heavyweight champ in 1994. After naming his first four sons "George," what did Foreman name his fifth son?