Until recently, criminals in the US were executed using an electric chair. Nowadays a different form of execution by lethal injection is practised. Before the electric chair, the condemned criminals were hanged. However, a dentist Dr Alfred P. Southwick happened to witness a drunken man getting electrocuted and dying instantly when he touched a live…
Alexander Graham Bell was a Scottish-born American inventor famous for the invention of the telephone. He died on August 2, 1922. On the day that Alexander Graham Bell was buried, millions of phones in America and Canada went dead for one minute as a mark of respect for the inventor.
In about 1607, Galileo invented an instrument that could measure the rise of water in a glass tube with the rise in temperature. This instrument is called a thermoscope. Later, scientists modified it to add a scale to mark the rise of water. Subsequently, water was replaced with alcohol and mercury.
Alfred Nobel was a Swedish industrialist, engineer and inventor. He was into construction and that led him to perform an experiment to find out ways of blasting rocks. His research led him to nitroglycerine. He found out that mixing silica with nitroglycerine would make it easy to handle. This mixture is known today as dynamite.
Back in the nineteenth century, the Brahmo Movement emerged in colonial Bengal. It was a social and religious movement that centred around the institution known as the Brahmo Samaj. The movement was initiated by Raja Rammohan Roy (1772–1833), who is famous in history for his crusade against the age-old practice of Sati. Rammohan established the…
In 1962 the satellite Telstar was developed by AT&T and it was placed in an orbit of 682 to 4,030 miles (i.e. 1,091 to 6,444 km) orbiting the earth in 2 hours 40 minutes. The first transatlantic television signals were transmitted through Telstar. With the launch of Telstar, wireless communications, such as voice, television, fax and…
