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The expensive tissue hypothesis (ETH) relates brain and gut size in evolution (specifically in human evolution).It suggests that in order for an organism to evolve a large brain without a significant increase in basal metabolic rate (as seen in humans), the organism must use less energy on other expensive tissues; the paper introducing the ETH suggests that in humans, this was achieved by ...
The Sunrise Ruby [1] [2] [3] has been the world's most expensive ruby, most expensive coloured gemstone, and most expensive gemstone other than a diamond [2] [3] [4] until the discovery of the Estrela de Fura. Originally mined in Myanmar, its current name is derived from a poem of the same name, written by the 13th-century Sufi poet Rumi. [5]
Variscite has been used in Europe to make personal ornaments, especially beads, since Neolithic times. Its use continued during the Bronze Age and in Roman times although it was not until the 19th century that it was determined that all variscite used in Europe came from three sites in Spain, Gavá (Barcelona), Palazuelo de las Cuevas (Zamora), and Encinasola (Huelva).
Prasiolite is a rare stone in nature; artificial prasiolite is produced from amethyst. [4] Most amethyst will turn yellow or orange when heated, producing heat-treated amethysts which are often marketed as citrine , but some amethyst will turn green when treated.
Jewelry can be terribly expensive, and this piece is no exception. The Natural Clam Pearls necklace up for sale on Etsy by ArtofpearlsCH for $56,530.01. A handmade item, this art nouveau styled ...
However, it is believed that the earliest evidence of construction in the world is the 1.8 million year-old stone circle found at Olduvai Gorge representing the remains of a windbreak. [ 3 ] By the mesolithic era, humans started to develop agriculture. [ 4 ]