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The Cretaceous–Paleogene ( K–Pg) extinction event, [ a] also known as the Cretaceous–Tertiary (K–T) extinction, [ b] was the mass extinction of three-quarters of the plant and animal species on Earth [ 2][ 3] approximately 66 million years ago. The event caused the extinction of all non-avian dinosaurs.
July 20. Buzz Aldrin's bootprint on the Moon. 1651 – Wars of the Three Kingdoms: After crossing the Firth of Forth, English Commonwealth forces defeated a Scottish army at the Battle of Inverkeithing, opening the rest of the country to occupation. 1867 – The United States Congress established the Indian Peace Commission to seek peace ...
Youngest Toba eruption. / 2.6845; 98.8756. The Toba eruption (sometimes called the Toba supereruption or the Youngest Toba eruption) was a supervolcanic eruption that occurred about 74,000 years ago during the Late Pleistocene [ 2] at the site of present-day Lake Toba in Sumatra, Indonesia.
t. e. The Pleistocene ( / ˈplaɪstəˌsiːn, - stoʊ -/ PLY-stə-seen, -stoh-; [ 5 ][ 6 ] often referred to colloquially as the Ice Age) is the geological epoch that lasted from c.2.58 million to 11,700 years ago, spanning the Earth's most recent period of repeated glaciations. Before a change was finally confirmed in 2009 by the ...
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
The timeline of the COVID-19 pandemic lists the articles containing the chronology and epidemiology of SARS-CoV-2, [ 1] the virus that causes the coronavirus disease 2019 ( COVID-19) and is responsible for the COVID-19 pandemic . The first human cases of COVID-19 occurred in Wuhan, People's Republic of China, on or about 17 November 2019. [ 2]
The 1980s (pronounced "nineteen-eighties", shortened to "the '80s" or "the Eighties") was a decade that began on January 1, 1980, and ended on December 31, 1989.. The decade saw a dominance of conservatism and free market economics, and a socioeconomic change due to advances in technology and a worldwide move away from planned economies and towards laissez-faire capitalism compared to the 1970s.
1971: Place cells in the brain are discovered by John O'Keefe. 1974: Russell Alan Hulse and Joseph Hooton Taylor, Jr. discover indirect evidence for gravitational wave radiation in the Hulse–Taylor binary. 1977: Frederick Sanger sequences the first DNA genome of an organism using Sanger sequencing.