The word ‘vaccine’ is derived from the Latin word vacca meaning cow. A vaccine is prepared from killed microbes or other substances that resemble the activity of the organisms that are known to cause the disease. English physician and scientist Edward Jenner established the system of vaccination. He used the vaccination material extracted from virus of affected cows. …
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 …
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.
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.
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.
The fourth of July is celebrated as the Independence Day in the US. Coincidentally, three US Presidents died on the fourth of July. They were John Adams and Thomas Jefferson, who died on the same day in 1826, and James Monroe, who died in 1831.
