The Chicxulub crater is an impact crater buried underneath the Mexican Yucatán Peninsula, with its center located offshore, near the town of Chicxulub. The crater is about 180 kilometers (110 mi) in diameter, making it one of the largest confirmed impact structures in the world; the asteroid whose impact (animation shown) formed the crater was at least 10 km (6 mi) in diameter. Discovered by geophysicists looking for petroleum in the late 1970s, the impact structure was formed around 66 million years ago near the end of the Cretaceous period. It is widely accepted that the devastation and climate disruption from the impact was the cause of the Cretaceous–Paleogene extinction event, in which around 75 percent of all plant and animal species on Earth became extinct, including all non-avian dinosaurs. A 2021 study stated that the impactor likely originated in the outer main part of the asteroid belt.
Read more: https://en.wikipedia.org/wiki/Chicxulub_crater
_______________________________ Today's selected anniversaries:
1777:
American Revolutionary War: Fort Clinton and Fort Montgomery were captured by British forces under Sir Henry Clinton, dismantling the Hudson River Chains. https://en.wikipedia.org/wiki/Battle_of_Forts_Clinton_and_Montgomery
1908:
Austria-Hungary announced the annexation of Bosnia and Herzegovina, causing a crisis that permanently damaged the country's relations with the Russian Empire and the Kingdom of Serbia. https://en.wikipedia.org/wiki/Bosnian_Crisis
1973:
Egyptian forces crossed the Suez Canal to launch an attack on the fortified Israeli Bar Lev Line, starting the Yom Kippur War. https://en.wikipedia.org/wiki/Operation_Badr_%281973%29
1989:
About 200 members of the San Francisco Police Department instigated a police riot in the Castro following a peaceful protest held by ACT UP. https://en.wikipedia.org/wiki/Castro_Sweep
_____________________________ Wiktionary's word of the day:
subliminal: 1. (physiology) Of a stimulus: below the limen or threshold of conscious perception, especially if still able to produce a response; also (generally), below the threshold where a response can be produced. 2. (psychology) Without directed awareness or thought; subconscious (dated), unconscious. 3. (by extension) Of an advertisement, a message, etc.: conveyed in a manner that a person is unaware of being influenced by it. 4. (physiology) Chiefly preceded by the: something which is below the limen or threshold of conscious perception. 5. (psychology) Chiefly preceded by the: the subconscious (dated) or unconscious self. 6. (by extension) An advertisement, a message, etc., which is conveyed in a manner that a person is unaware of being influenced by it. https://en.wiktionary.org/wiki/subliminal
___________________________ Wikiquote quote of the day:
Beware of assumptions that seem 'obvious' in one decade. They may become quaint in the next. --David Brin https://en.wikiquote.org/wiki/David_Brin