Wikipedia:Main Page history/2023 January 8

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Alfred Russel Wallace

Alfred Russel Wallace (8 January 1823 – 7 November 1913) was a British naturalist, explorer, and biologist. He is known for independently conceiving the theory of evolution through natural selection. Wallace did extensive fieldwork, identified the faunal divide called the Wallace Line, and was considered the 19th century's leading expert on the geographical distribution of animal species, leading some to call him the father of biogeography, or more specifically of zoogeography. An account of his adventures in Southeast Asia, titled The Malay Archipelago, was published in 1869. He worked on warning coloration in animals, and on reinforcement, a way that natural selection could contribute to speciation by encouraging barriers against hybridisation. He was also a social activist, critical of the social and economic system of 19th-century Britain. He was one of the first prominent scientists to raise concerns over the environmental impact of human activity. (Full article...)

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Sheikh Mujibur Rahman
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Elephant's Trunk Nebula

The Elephant's Trunk Nebula is a concentration of interstellar gas and dust within the much larger ionized gas region IC 1396 located in the constellation Cepheus about 2,400 light-years away from Earth. The combined action of the light from the massive star ionizing and compressing the rim of the cloud, and the wind from the young stars shifting gas from the center outward led to very high compression in the nebula. This pressure has triggered the current generation of protostars. This photograph of the Elephant's Trunk Nebula was taken with a 127 mm (5.0 in) refracting telescope.

Photograph credit: Chuck Ayoub

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