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Sunday, 15 November 2020

Saturday, 14 November 2020

Project Excalibur

  November 14, 2020      No comments   Edit
Project Excalibur.
Project Excalibur was an American Cold War–era research program to develop nuclear-device-powered, space-based X-ray lasers as a ballistic missile defense. X-ray lasers were conceived in the 1970s by George Chapline Jr. (pictured with George Maenchen) and further developed by Peter L. Hagelstein, both working at Lawrence Livermore National Laboratory under Edward Teller. After a promising test, Teller discussed the proposal in 1981 with US president Ronald Reagan, who in 1983 incorporated it in his Strategic Defense Initiative. Further underground nuclear tests suggested progress was being made. Reagan refused to abandon the technology at the 1986 Reykjavík Summit arms-control talks, even after a critical test demonstrated it was not working as expected. Researchers at Livermore and Los Alamos began to raise concerns about test results, and the infighting became public. In 1988 the program budget was cut dramatically, after additional problems were revealed.

Friday, 13 November 2020

Edward Thomas Daniell

  November 13, 2020      No comments   Edit
Edward Thomas Daniell.
Edward Thomas Daniell was an English artist known for etchings and Middle Eastern landscape paintings. Taught by John Crome and Joseph Stannard, he is associated with the Norwich School of painters, who were mainly inspired by the Norfolk countryside. After graduating in classics at Balliol College, Oxford, in 1828, he was ordained as a curate in 1832 and appointed to a curacy in London in 1834. He became a patron of the arts, and a friend of the artist John Linnell. In 1840, after resigning his curacy and leaving for the Middle East, he encountered the archaeological expedition of Charles Fellows in Lycia, and joined as their illustrator. He contracted malaria and died from a second attack of the disease. He normally used a small number of colours for his watercolour paintings; his distinctive style was influenced in part by Crome, J. M. W. Turner and John Sell Cotman. As an etcher he anticipated the modern revival of etching that began in the 1850s.

Thursday, 12 November 2020

St. Croix macaw

  November 12, 2020      No comments   Edit
St. Croix macaw.
The St. Croix macaw (Ara autocthones) is an extinct species of macaw whose remains have been found on the Caribbean islands of St. Croix and Puerto Rico. It was a medium-sized macaw of unknown coloration, slightly larger than the extinct Cuban macaw. It was described in 1937 based on a tibiotarsus leg bone (pictured) unearthed from a kitchen midden at a pre-Columbian site on St. Croix. A second specimen consisting of various bones from a similar site on Puerto Rico was described in 2008, and a coracoid from Montserrat may belong to this or another extinct species of macaw. The St. Croix macaw is one of 13 extinct macaw species that have been proposed to have lived on the Caribbean islands. Macaws were frequently transported for long distances by humans in both prehistoric and historic times, so it is impossible to know whether species only known from bones or written accounts were native or imported species.
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