Video encyclopedia

Flashback calendar

Leap second is used for the first time

The universal world’s time was increased by one second in order to keep the super-accurate atomic clock in step with the Earth's rotation. The rotation is not regular and one day measured by atomic clock is slightly shorter than the average solar day. Hence it is sometimes necessary to correct this difference. As of June 2018, the lead second had to be added 27 times.

Bell Labs publicly demonstrates the first point-contact transistor

The transistor was publicly announced at a press conference in New York and it was named by electrical engineer John Pierce. Bell Labs chemists Gordon Teal and Morgan Sparks had successfully produced a working bipolar NPN junction amplifying germanium transistor.

The U.S. patent for Transmitting Pictures over Wireless is granted

Jenkins moved on to work on television. He published an article on "Motion Pictures by Wireless" in 1913, but it was not until December 1923 that he transmitted moving silhouette images for witnesses, and it was in June 1925 that he publicly demonstrated synchronized transmission of pictures and sound. He was granted the U.S. patent No. 1,544,156.

Famous discussion about evolution takes place

The main protagonists were biologist Thomas Huxley and Christian priest Samuel Wilberforce. Wilberforce asked Huxley whether it was through his grandfather or his grandmother that he claimed his descent from a monkey. Huxley replied that he would not be ashamed to have a monkey for his ancestor, but he would be ashamed to be connected with a man who used his great gifts to obscure the truth.

Anniversaries of the (in)famous