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2 años atrás 2 años atrás Los conocimientos astronómicos de la Tribu Dogón: ¿dados por antiguos astronautas? por Erick Nielssen2 años atrás2 años atrás 23 SHARES Crédito: NASA / Arte Historia / Galleria Primitiva / Tumblr. - Edición: Erick Nielssen. La Tribu Dogón tiene una mitología de deidades extraterrestres que viajaron desde la estrella Sirio hace más de 3.000 años. Según antropólogos, los Dogón conocieron el sistema estelar de Sirio. También sabían de las órbitas de planetas, las lunas de Júpiter y los anillos de Saturno. Se teoriza que su conocimiento astronómico fue dado por unos antiguos astronautas llamados Nommo. Los Dogón o dogones son un pueblo ancestral de Malí, en el oeste de África. Viven en un conjunto de villas entre montañas rocosas. Su cultura y sociedad se basa mucho en el mito de la creación de ellos, que habla de esos seres que viajaron desde Sirio. Los Dogón y el sistema estelar de Sirio Pin Sistema estelar Sirio. Crédito: NASA. Sirio es la estrella más brill...

septiembre 25, 2021 CIENTÍFICOS CHINOS DESCUBREN RESTOS DE MOLÉCULAS ORGÁNICAS EN UN DINOSAURIO Paleontólogos chinos han aislado células de cartílago exquisitamente conservadas en un dinosaurio de 125 millones de años que contiene núcleos con restos de moléculas orgánicas y cromatina. El estudio del Instituto de Paleontología y Paleoantropología de Vertebrados (IVPP) de la Academia de Ciencias de China y del Museo de la Naturaleza de Shandong Tianyu (STM) ha sido publicado en Communications Biology. El dinosaurio, llamado Caudipteryx, era un omnívoro del tamaño de un pavo real con largas plumas en la cola. Vagaba por las orillas de los lagos poco profundos de Jehol Biota en la provincia de Liaoning durante el Cretácico Inferior. “Los datos geológicos se han acumulado a lo largo de los años y han demostrado que la preservación de fósiles en la Biota de Jehol fue excepcional debido a las finas cenizas volcánicas que sepultaron los cadáveres y los preservaron hasta el nivel celula...

When Mexican scientist Luis Miramontes signed his lab notebook on October 15, 1951, he didn’t know he was documenting history. That day, he made a new molecule — norethindrone. Derived from the wild Mexican yam that locals call barbasco, norethindrone became one of the first active ingredients in birth control pills. “The pill” gave women control over when they had children and let men and women enjoy sex without the chance of reproduction, thus ushering in seismic social change. Miramontes’ notebook page has been immortalized in books and articles by his former supervisor, Carl Djerassi, as well as reporters. Yet compared with Djerassi and others who contributed to the pill, Miramontes attained little recognition, says Gabriela Soto Laveaga, a historian of science at Harvard University and author of Jungle Laboratories: Mexican Peasants, National Projects, and the Making of the Pill. “It isn’t until recently that Miramontes has even been spoken about.” black and white image o...

All Search across 12,000+ articles Home / News One of the ancient Japanese skulls from which DNA was extracted. Credit: Shigeki Nakagome / Trinity College Dublin UPDATED 19 SEPTEMBER, 2021 - 18:40 SAHIR Ancient DNA Rewrites Story of Japanese Ancestry READ LATER PRINT The archipelago nation of Japan has been occupied since the Upper Paleolithic period (36,000 BC), and dual genomic Japanese ancestry has been the dominant theory, up until now. A new study carried out by Trinity College Dublin, published in the journal Sciences Advances , has completely changed this narrative, pointing to a tripartite Japanese ancestry, i.e., genetic origins from three different, ancient populations. "We are very excited about our findings on the tripartite structure of Japanese populations. This finding is significant in terms of rewriting the origins of modern Japanese by taking advantage of the power of ancient genomics," said Professor Shigeki Nakagome, a geneticist at Trinity College ...

PLANETARY SCIENCE Are Saturn’s Rings Really as Young as the Dinosaurs? A surprisingly youthful estimate of the age of the rings has stirred a backlash. At stake is our best clue for understanding where the rings came from in the first place. 1 READ LATER Saturn’s rings are largely made of ice particles, with some dust mixed in. In this false-color image, purple bands contain particles more than 5 cm across. Green regions have particles under 5 cm, and blues contain some small, pea-like particles. Giant, boulder-size chunks of ice can be found throughout the rings. NASA/JPL The Cassini spacecraft perished in a literal blaze of glory on September 15, 2017, when it ended its 13-year study of Saturn by intentionally plunging into the gas giant’s swirling atmosphere. The crash came after a last few months of furious study, during which Cassini performed the  Grand Finale  — a sensational, death-defying dance that saw the spac...

A New Device Uses Sunlight to Create Drinking Water From Air   Biwa/Getty IN BRIEF Scientists have developed a sunlight-powered device that can extract water even from desert skies. The device is powered passively by sunlight and may provide an answer to the billions facing severe water shortages around the world. AN URGENT NEED MET According to the World Health Organization  (WHO), 663 million people — one in ten — lack access to safe water. Fully  one-third of the world’s population  lacks plumbing enough to have access to a toilet—that’s more than 2.4 billion people. A  2016 report  found that water shortages affect two-thirds of the world’s population.  Water shortages  — and the conflicts they cause — will worsen as climate change ramps up. In fact, the  2015 World Economic Forum  cited lack of access to clean water as the number one global risk in existence today. Working to find a solution to these problems, ...

Unmaking inequality: a history of violence Walter Scheidel (Stanford University) Borgerhoff Mulder et al., Science 326 (2009): study of intergenerational wealth transmission and dynamics of inequality in 21 small-scale societies (type of wealth/wealth transmission) Growing resource inequality in England and Wales Share of the richest 1% in national net worth 1700 39% 1740 44% 1810 55% 1875 61% 1911/13 69% Summary of the argument Development tends to increase resource inequality Agrarianism; Industrialism Violent shocks are the only factors capable of significantly reducing resource inequality (for a while) Violence Mass-mobilization wars Transformative revolutions State collapse Demographic contraction Pandemics Other factors are exotic or ineffective (abolition of slavery, migration, financial crises) Only a particular type of war generally lowers inequality! Requires mass mobilization that • raises state demands on the rich (to pay for war) • raises redistribution to th...