DMITRY MENDELEEV PUBLISHED HIS PERIODIC TABLE 150 YEARS AGO

DMITRY MENDELEEV PUBLISHED HIS PERIODIC TABLE 150 YEARS AGO

Russian chemistry professor Dmitri Mendeleev published his periodic table in 1869. Mendeleev’s table, dated March 1 1869, was his first published version. He constructed his tables by listing the elements in rows or columns in order of atomic weight and starting a new row or column when the characteristics of the elements began to repeat.

A CHRITSTMAS CAROL FIRST PUBLISHED 175 YEARS AGO

A CHRITSTMAS CAROL FIRST PUBLISHED 175 YEARS AGO

A Christmas Carol. In Prose. Being a Ghost Story of Christmas, commonly known as A Christmas Carol, is a novella by Charles Dickens, first published in London by Chapman & Hall in 1843 and illustrated by John Leech. A Christmas Carol recounts the story of Ebenezer Scrooge, an elderly miser who is visited by the ghost of his former business […]

SMILEY WAS CREATED 55 YEARS AGO

SMILEY WAS CREATED 55 YEARS AGO

A smiley (sometimes called a happy face or smiley face) is a stylized representation of a smiling humanoid face that is a part of popular culture worldwide. The classic form designed by Harvey Ball in 1963 comprises a yellow circle with two black dots representing eyes and a black arc representing the mouth (😃)

PENICILLIN DISCOVERED 90 YEARS AGO

PENICILLIN DISCOVERED 90 YEARS AGO

Sir Alexander Fleming, a Scottish researcher, is credited with the discovery of penicillin in 1928. At the time, Fleming was experimenting with the influenza virus in the Laboratory of the Inoculation Department at St. Mary’s Hospital in London.

CHELYABINSK METEOR EXPLODED 5 YEARS AGO

CHELYABINSK METEOR EXPLODED 5 YEARS AGO

The Chelyabinsk meteor was a superbolide caused by an approximately 20-metre near-Earth asteroid that entered Earth’s atmosphere over Russia on 15 February 2013 at about 09:20 YEKT, with a speed of 19.16 ± 0.15 kilometres per second (60,000–69,000 km/h).