" To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact. "
Charles Darwin

Back in the day


First Electric Traffic Light Is Installed

Prior to 1914, there had been several attempts to create automobile traffic signals similar to those used by railroads, but it was only after a four-way electric signal was installed in Cleveland, Ohio, that the modern traffic light system began to take root. The signal had only two colors, green and red, but the three-color version still in use today was not far off. Besides railroad signals, what earlier application of red and green might have led to the use of these colors in traffic lights?




Considered by some to be an important form of alternative medicine, qigong is an ancient Chinese system of postures, exercises, breathing techniques, and meditations. Its central idea is the control and manipulation of qi—also known as chi—believed by practitioners to be the fundamental life energy responsible for health and vitality. In China, qigong is used in conjunction with other medical therapies for many chronic conditions. How is qigong related to the practice of martial arts?

Born on a day like today


Neil Alden Armstrong

Armstrong became a pilot at 16, studied aeronautical engineering, and won three medals as a US Navy pilot in the Korean War. He became test pilot in 1955 and joined the space program in 1962. He made history in 1969, when he became the first person to walk on the Moon, a feat he famously declared "one giant leap for mankind." Though this brought him worldwide renown, he has, for the most part, avoided the limelight. What unusual legal battle did he face with his barber in 2005?

Last updated on Sunday, 5th August 2012

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