08 janeiro 2017
Simpatia para recuperar amor perdido – Simpatia de Santo Antônio
Tyrian purple, a natural dye, was so expensive that its use...
Tyrian purple, a natural dye, was so expensive that its use was restricted to royalty. It was discovered about 1,500 BCE. The dye was obtained from two genera of one species of shellfish. It was estimated that 8,500 shellfish were required to produce one gram of dye, so only small amounts could be produced and the price was very high. Ultimately, a restrictive policy of the eastern emperors caused the art to be practised by only a few, and around the start of the 1100s CE, when Byzantium was suffering from attacks without and dissensions within, the secret of Tyrian purple was lost. Thankfully, the secret of Tyrian purple was rediscovered in England around the year 1683.
January 8th 1823: Alfred Russel Wallace bornOn this day in...
January 8th 1823: Alfred Russel Wallace born
On this day in 1823, British naturalist Alfred Russel Wallace was born in Wales. Wallace was raised in Hertford, England, attending Hertford Grammar School, now Richard Hale School. Wallace worked for a time as a surveyor, which developed his love for nature and laid bare social inequalities, introducing him to socialism. He read widely on works of natural history, and in 1848 travelled to Brazil to collect natural specimens for sale and study in Britain. When he published some of his findings, Wallace was acclaimed by British scientists, and continued to travel around the world researching the natural world. During his time in the Malay Archipelago, he developed a theory of the origin of new species, positing that new species arise from the development of pre-existing species in the struggle for survival; essentially, it was a theory of evolution. Wallace sent his writings to fellow naturalist Charles Darwin, who was struck by the similarities with his own theory. In 1858, Darwin and Wallace published their findings as a paper entitled ‘On the Tendency of Species to Form Varieties; and on the Perpetuation of Varieties and Species by Natural Means of Selection’. However, it was Darwin’s On the Origin of Species, published the next year, which really gripped the public imagination, hence the focus on Darwin in discussions of evolutionary theory. Wallace continued to write zoological and naturalist works, though increasingly became interested in social issues, advocating women’s rights and socialism. Alfred Russel Wallace died in Dorset in 1913 aged ninety. While Wallace’s contribution to our knowledge of man’s origins is often eclipsed by Darwin, recent years have seen a renewed interest in the progressive, nature-loving scientist.
Visit –> all-about-psychology.com for free psychology...
snow falls on central europe, winter 2016/17: photographed by...
snow falls on central europe, winter 2016/17: photographed by suomi npp weather satellite, 25th december-7th january.
the second gif gives some geographical context by adding the names of some capital cities and major bodies of water in the frame.
image credit: noaa. animation: ageofdestruction
ageThe first people to harvest chocolate were the Mokaya and other pre-Olmec peoples who lived in...
TODAY IN THE HISTORY OF PSYCHOLOGYVisit –>...
TODAY IN THE HISTORY OF PSYCHOLOGY
Visit –> http://ift.tt/1KoEaNY to learn all about the life and work of Carl Rogers.