ARTE - Camera Lucida - Missions Printemps - Accueil Fossil Hominids, Human Evolution: Thomas Huxley & Eugene Dubois Fossil Hominids, Human Evolution: Thomas Huxley & Eugene Dubois When Charles Darwin wrote the Origin of Species, he had to wonder about how humans came to be. Humans had hereditary variation in every generation, and some individuals had more children than others — the key ingredients for natural selection. But Darwin also knew that he had no fossil record to use to develop a hypothesis about human evolution. First human fossils discovered Even when the first part of a fossil human came to light in 1857, naturalists had a hard time recognizing it for what it truly was. Shortly after Darwin published the Origin of Species, his great champion Thomas Huxley (right) considered the skull from the Neander valley. Darwin publishes on human origins Amid these ambiguous developments, Darwin decided to say something about human origins. More human fossils discovered Fossils would be crucial to resolving this debate, but they were slow in coming.
Introduction 1. INTRODUCTION A typical ichthyosaur looks like this (see note for derivation and pronunciation of "ichthyosaur", as well as its usage in this page). Yes, just like a fish. The strange thing is that they were not fish at all: they were reptiles like lizards, snakes, and crocodiles. You can easily tell this by looking at the skull and fins. A similar case is known for mammals too: think about dolphins and whales.
Teaching About Evolution and the Nature of Science In a 1786 letter to a friend, Thomas Jefferson called for "the diffusion of knowledge among the people. No other sure foundation can be devised for the preservation of freedom and happiness."1 Jefferson saw clearly what has become increasingly evident since then: the fortunes of a nation rest on the ability of its citizens to understand and use information about the world around them. We are about to enter a century in which the United States will be even more dependent on science and technology than it has been in the past. Such a future demands a citizenry able to use many of the same skills that scientists use in their work—close observation, careful reasoning, and creative thinking based on what is known about the world. The ability to use scientific knowledge and ways of thinking depends to a considerable extent on the education that people receive from kindergarten through high school. Nevertheless, religious faith and scientific knowledge, which are both useful and important,
Amazonie - Le souffle indien simulation - Evolution of life Notre planète a hébergé et héberge un nombre incroyable de formes de vie ! Un peu plus et l’on s’y perdrait… Et pourtant… Pourtant les scientifiques n’ont eu de cesse de les trier, de les ranger, de les classer. Et depuis Charles Darwin, la théorie de l’évolution a donné encore plus de sens à ce travail de titan puisque la classification actuelle résume les liens de parenté entre les êtres vivants et nous parle ainsi de leur histoire évolutive. Venez ici faire de l’acrobatie sur un arbre bien singulier : celui du vivant ! Crédits Scénario, animation & réalisation : Yannick MahéDesign & programmation : Thomas CussonneauDéveloppement de "L'arbre du vivant" : Emmanuel GrandadamIllustrations : Gilles MacagnoText : Adeline AndréProduction : CNDP (2011) Parrain scientifique Guillaume Lecointre Muséum national d'histoire naturelle, Département Systématique & Evolution, Paris, France Systématique
What did our ancestors look like? Hair and eye color can be determined for ancient human remains A new method of establishing hair and eye colour from modern forensic samples can also be used to identify details from ancient human remains, finds a new study published in BioMed Central's open access journal Investigative Genetics. The HIrisPlex DNA analysis system was able to reconstruct hair and eye colour from teeth up to 800 years old, including the Polish General Wladyslaw Sikorski (1881 to 1943) confirming his blue eyes and blond hair. A team of researchers from Poland and the Netherlands, who recently developed the HIrisPlex system for forensic analysis, have now shown that this system is sufficiently robust to successfully work on older and more degraded samples from human remains such as teeth and bones. The system looks at 24 DNA polymorphisms (naturally occurring variations) which can be used to predict eye and hair colour.
The Immortal Life « Rebecca Skloot Her name was Henrietta Lacks, but scientists know her as HeLa. She was a poor black tobacco farmer whose cells—taken without her knowledge in 1951—became one of the most important tools in medicine, vital for developing the polio vaccine, cloning, gene mapping, in vitro fertilization, and more. Henrietta’s cells have been bought and sold by the billions, yet she remains virtually unknown, and her family can’t afford health insurance. Soon to be made into an HBO movie by Oprah Winfrey and Alan Ball, this New York Times bestseller takes readers on an extraordinary journey, from the “colored” ward of Johns Hopkins Hospital in the 1950s to stark white laboratories with freezers filled with HeLa cells, from Henrietta’s small, dying hometown of Clover, Virginia, to East Baltimore today, where her children and grandchildren live and struggle with the legacy of her cells.
Prototype étudiant crossmédias: « Marie Curie, femme de science » sur iPad et tablettes Il n’y a sans doute pas de meilleur moment que celui-ci, alors que nous fêtons les cent ans du second prix Nobel de Marie Curie née Sklodowska, prix Nobel de chimie, et alors que nous sommes ici à l’institut Pierre et Marie Curie, pour présenter notre application. Application ou site web, car par volonté d’ouverture nous avons décidé d’utiliser des technologies opensource, mais Lazhar en reparlera. Nous avons travaillé sur ce projet à sept, Baptiste, Fatiha, Nicolas, Raphaël, Stéphane, Lazhar et moi-même. Un groupe important, certes, mais qui a su — je pense — tirer parti des multiples compétences de chacun, en passant par le graphisme et le design de l’application, à sa programmation, ou à la rédaction des contenus et au choix des images. Crédit : Nicolas AMENDOLA – Lazhar BARKAOUI – Fatiha EL MOUKTAFI – Baptiste GIMONNET – Clément LARRIVE – Stéphane PERES – Raphaël VELT Comprendre ! Regardez ! Testez le ! mariecurie.leden.org/ipad/
Qu'est-ce qu'une espèce ? Pour décrire l’incroyable diversité du monde vivant, pour classer les êtres vivants, les systématiciens ont été amenés à établir une hiérarchie au sein des niveaux de description. Chaque être vivant appartient ainsi à un règne, un embranchement, une classe, une infraclasse, un ordre, un genre et à une espèce… Lorsqu’on entend parler de diversité du monde vivant, il s’agit aussi de diversité des espèces.Ce terme d’« espèce » était avant tout utilisé par Platon pour désigner n’importe quelle catégorie d’organisme. De nos jours, ce concept est restreint à un des niveaux de description de la diversité.
Convergent Evolution: Hyenas Offer Clues To The Human Past : 13.7: Cosmos And Culture When anthropologists work to reconstruct the lives of our own ancestors we bring together multiple sources of information. We look at fossils and material culture, such as ancient tool technologies. We even look at animals alive today whose behavioral patterns might provide clues to our past. When it comes to these animal models, we think first of apes. So why not look for clues from more distant animal kin? hide captionSpotted hyena cubs socialize at their communal den in the Maasai Mara National Reserve, Kenya Courtesy of Deanna Russell Spotted hyena cubs socialize at their communal den in the Maasai Mara National Reserve, Kenya I like Smith et al.' So let's unpack all this. As the Current Anthropology article explains, about 85 percent of terrestrial mammalian carnivores are solitary outside of mating and parental-care contexts. They're more socially complex than carnivores like wolves, lions and wild dogs. But exactly what is it that hyenas are doing that apes aren't doing?