Human species 'may split in two' Humanity may split into two sub-species in 100,000 years' time as predicted by HG Wells, an expert has said.
Evolutionary theorist Oliver Curry of the London School of Economics expects a genetic upper class and a dim-witted underclass to emerge. The human race would peak in the year 3000, he said - before a decline due to dependence on technology. All 2.3 Million Species Are Mapped into a Single Circle of Life. Since Charles Darwin's day, biologists have depicted how new organisms evolve from old ones by adding branches to numerous trees that represent portions of the animal, plant and microbial kingdoms.
Researchers from a dozen institutions recently completed a three-year effort to combine tens of thousands of trees into one diagram, most readable as a circle (below). The lines inside the circle represent all 2.3 million species that have been named. Biologists have genetic sequences for only about 5 percent of them, however; as more are finished, the relationships within and across groups of species may change. Experts estimate that up to 8.7 million species may inhabit the planet (about 15,000 are discovered every year).
“We expect the circle to broaden,” says Karen Cranston, a computational evolutionary biologist at Duke University. Anyone can propose updates to the database (OpenTreeOfLife.org). Click or tap to enlarge. Pesticidas versus mosquitos, uma guerra perdida. Na coluna ‘Planeta em transe’, Jean Remy Guimarães questiona a adoção de larvicidas em água potável contra o ‘Aedes aegypti’ e diz que possível relação entre uso indiscriminado dessas substâncias e microcefalia deve ser analisada.
O Brasil já viveu tempos de vergonha e de glória em sua longa luta contra doenças transmitidas por vetores como mosquitos. Em seu auge, a epidemia de febre amarela no Rio de Janeiro, no início do século passado, foi tão devastadora que folhetos e cartazes das principais empresas de navegação entre Europa e América do Sul colocavam como vantagem de seus roteiros para Buenos Aires o fato de não incluírem escala na cidade. Depois de controlar a epidemia na Baixada Santista com intervenções na drenagem e saneamento, entre outras abordagens, Oswaldo Cruz foi convocado a repetir o sucesso no Rio de Janeiro. Nobel da Medicina choca geneticistas ao afirmar que negros são menos inteligentes. LONDRES - O prêmio Nobel de Medicina James Watson, pioneiro no trabalho de deciframento do genoma humano, causou espanto ao reacender com força total uma polêmica que parecia definitivamente superada pelos próprios geneticistas.
O pesquisador americano, de 79 anos, declarou ao jornal "The Sunday Times" ser pessimista sobre a África porque as políticas ocidentais para os países africanos eram, erroneamente, baseadas na presunção de que os negros seriam tão inteligentes quanto os brancos quando, na verdade "testes" sugerem o contrário. Watson não apresentou argumentos científicos para embasar suas idéias nem especificou que "testes" seriam esses. Afirmou apenas que os genes responsáveis pelas diferenças na inteligência humana devem ser descobertos dentro de dez a 15 anos. "Não há nenhuma razão sólida para sustentar que as capacidades intelectuais de pessoas geograficamente separadas durante sua evolução tenham se desenvolvido de forma idêntica. Evolução – o que vem agora? Selfish traits not favoured by evolution, study shows. 2 August 2013Last updated at 06:29 ET By Melissa Hogenboom Science reporter, BBC News Humans and animals could not evolve in a co-operative environment by being selfish, scientists say Evolution does not favour selfish people, according to new research.
This challenges a previous theory which suggested it was preferable to put yourself first. Instead, it pays to be co-operative, shown in a model of "the prisoner's dilemma", a scenario of game theory - the study of strategic decision-making. Published in Nature Communications, the team says their work shows that exhibiting only selfish traits would have made us become extinct. Game theory involves devising "games" to simulate situations of conflict or co-operation. Continue reading the main story “Start Quote It's almost like what we had in the cold war, an arms race - but these arms races occur all the time in evolutionary biology” End QuoteDr Christoph Adami Michigan State University Freedom or prison Co-operating is key for evolution.
15 Answers to Creationist Nonsense. When Charles Darwin introduced the theory of evolution through natural selection 143 years ago, the scientists of the day argued over it fiercely, but the massing evidence from paleontology, genetics, zoology, molecular biology and other fields gradually established evolution's truth beyond reasonable doubt.
Today that battle has been won everywhere--except in the public imagination. Embarrassingly, in the 21st century, in the most scientifically advanced nation the world has ever known, creationists can still persuade politicians, judges and ordinary citizens that evolution is a flawed, poorly supported fantasy. They lobby for creationist ideas such as "intelligent design" to be taught as alternatives to evolution in science classrooms.
As this article goes to press, the Ohio Board of Education is debating whether to mandate such a change. Some antievolutionists, such as Philip E. 1. All sciences frequently rely on indirect evidence. 2. 3. 4. 5. 6. 7. 8. 9. 10. The Complete Work of Charles Darwin Online.