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John D. Hawks
John Hawks is an associate professor of anthropology at the University of Wisconsin–Madison. He also maintains a paleoanthropology blog. Contrary to the common view that cultural evolution has made human biological evolution insignificant, Hawks believes that human evolution has sped up in recent history. Biography Hawks graduated from Kansas State University in 1994 with degrees in French, English, and Anthropology. He received both his M.A. and Ph.D. in Anthropology from the University of Michigan where he studied under Milford Wolpoff. His doctoral thesis was titled, "The Evolution of Human Population Size: A Synthesis of Paleontological, Archaeological, and Genetic Data." After working as a postdoctoral fellow at the University of Utah, he moved to the University of Wisconsin–Madison, where he is currently a member of the Anthropology department, teaching courses including Human Evolution, Biological Anthropology, and Hominid Paleoecology. In 2014, Hawks launched an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, nine Minor Outlying Islands, and 326 Indian reservations. The United States is also in free association with three Pacific Island sovereign states: the Federated States of Micronesia, the Marshall Islands, and the Republic of Palau. It is the world's third-largest country by both land and total area. It shares land borders with Canada to its north and with Mexico to its south and has maritime borders with the Bahamas, Cuba, Russia, and other nations. With a population of over 333 million, it is the most populous country in the Americas and the third most populous in the world. The national capital of the United States is Washington, D.C. and its most populous city and principal financial center is New York City. Paleo-Americ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Human Mitochondrial Genetics
Human mitochondrial genetics is the study of the genetics of human mitochondrial DNA (the DNA contained in human mitochondria). The human mitochondrial genome is the entirety of hereditary information contained in human mitochondria. Mitochondria are small structures in cells that generate energy for the cell to use, and are hence referred to as the "powerhouses" of the cell. Mitochondrial DNA (mtDNA) is not transmitted through nuclear DNA (nDNA). In humans, as in most multicellular organisms, mitochondrial DNA is inherited only from the mother's ovum. There are theories, however, that paternal mtDNA transmission in humans can occur under certain circumstances. Mitochondrial inheritance is therefore non-Mendelian, as Mendelian inheritance presumes that half the genetic material of a fertilized egg (zygote) derives from each parent. Eighty percent of mitochondrial DNA codes for mitochondrial RNA, and therefore most mitochondrial DNA mutations lead to functional problems, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Homo Naledi
'' Homo naledi'' is an extinct species of archaic human discovered in 2013 in the Rising Star Cave, Cradle of Humankind, South Africa dating to the Middle Pleistocene 335,000–236,000 years ago. The initial discovery comprises 1,550 specimens, representing 737 different elements, and at least 15 different individuals. Despite this exceptionally high number of specimens, their classification with other ''Homo'' remains unclear. Along with similarities to contemporary ''Homo'', they share several characteristics with the ancestral ''Australopithecus'' and early ''Homo'' as well ( mosaic evolution), most notably a small cranial capacity of 465–610 cm3 (28.4–37.2 cu in), compared to 1,270–1,330 cm3 (78–81 cu in) in modern humans. They are estimated to have averaged in height and in weight, yielding a small encephalization quotient of 4.5. Nonetheless, ''H. naledi'' brain anatomy seems to have been similar to contemporary ''Homo'', which could indicate comparabl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
First Peoples (TV Program)
''First Peoples'' is a five-part PBS television documentary program about the first people on the Earth. The program aired in 2015. It shows how humans reached each continent, focusing on various fossil discoveries and placing them into the context of what research has discovered about pre-modern human migration. The program includes interviews with many of the researchers involved in these studies, such as geneticists Svante Pääbo and Eske Willerslev and anthropologists John D. Hawks and Nicole Waguespack. Episodes # "First Peoples: Americas" The episode begins with a lengthy discussion on Kennewick Man and what his DNA reveals about him. # "First Peoples: Africa" This episode discusses the Jebel Irhoud skull found in Morocco. It also discusses evidence of other humans in West and Central Africa. # "First Peoples: Asia" It emphasized man's need to explore. Because of that need they encountered other peoples. Modern human DNA shows the earliest ''Homo sapiens'' interbred wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dawn Of Humanity
''Dawn of Humanity'' is a 2015 American documentary film that was released online on September 10, 2015, and aired nationwide in the United States on September 16, 2015. The PBS NOVA National Geographic film, in one episode of two hours, was directed and produced by Graham Townsley. The film describes the 2013 discovery, and later excavation, of the fossil remains of ''Homo naledi'', an extinct species of hominin assigned to the genus ''Homo'', found within the Dinaledi Chamber of the Rising Star Cave system, located in the Cradle of Humankind, South Africa. Additionally, the National Geographic Society has multiple videos on its website covering different phases of the discovery and excavation of the fossils during a two-year period. , fossils of at least fifteen individuals, amounting to 1550 specimens, have been excavated from the cave. Participants The documentary film is narrated by Jay O. Sanders and includes the following participants (alphabetized by last name): * Reb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Through The Wormhole
''Through the Wormhole'' is an American science documentary television series narrated and hosted by American actor Morgan Freeman. It began airing on Science Channel in the United States on June 9, 2010. The series concluded its run on May 16, 2017. Development and production The Science Channel has been highlighting what VP of Production Bernadette McDaid calls the "Rock Stars of Science" and physics outreach such as Michio Kaku and Brian Cox. "We wanted to merge our 'Rock Stars of Science' ... with the superstars of pop culture." When Science general manager Deborah Myers heard that Morgan Freeman was very interested in things to do with the universe and space and "asks the big philosophical questions", she approached Freeman and his producer and proposed making a series together. On February 17, 2011, Sean Carroll confirmed on his Twitter page that filming of season 2 of ''Through the Wormhole'' began. On May 17, 2011, Discovery confirmed the second season would premi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Technorati
Technorati was a search engine and a publisher advertising platform that served as an advertising solution for the thousands of websites in its network. Technorati launched its ad network in 2008, and at one time was one of the largest ad networks reaching more than 100 million unique visitors per month. The name Technorati was a portmanteau of the words technology and literati, which evokes the notion of technological intelligence or intellectualism. In 2016, Synacor acquired Technorati for $3 million. The company's core product was previously an Internet search engine for searching blogs. The website stopped indexing blogs and assigning authority scores in May 2014 with the launch of its new website, which is focused on online publishing and advertising. Technorati was founded by Dave Sifry, with its headquarters in San Francisco, California, USA. Kevin Marks was the site's Principal Engineer. Tantek Çelik was the site's Chief Technologist. The site won the SXSW 2006 aw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hominin
The Hominini form a taxonomic tribe of the subfamily Homininae ("hominines"). Hominini includes the extant genera ''Homo'' (humans) and '' Pan'' (chimpanzees and bonobos) and in standard usage excludes the genus ''Gorilla'' (gorillas). The term was originally introduced by Camille Arambourg (1948). Arambourg combined the categories of ''Hominina'' and ''Simiina'' due to Gray (1825) into his new subtribe. Traditionally, chimpanzees, gorillas and orangutans were grouped together as pongids. Since Gray's classification, evidence has accumulated from genetic phylogeny confirming that humans, chimpanzees, and gorillas are more closely related to each other than to the orangutan. The former pongids were reassigned to the subfamily Hominidae ("great apes"), which already included humans, but the details of this reassignment remain contested; within Hominini, not every source excludes gorillas, and not every source includes chimpanzees. Humans are the only extant species in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hominidae
The Hominidae (), whose members are known as the great apes or hominids (), are a taxonomic family of primates that includes eight extant species in four genera: '' Pongo'' (the Bornean, Sumatran and Tapanuli orangutan); ''Gorilla'' (the eastern and western gorilla); '' Pan'' (the chimpanzee and the bonobo); and ''Homo'', of which only modern humans remain. Several revisions in classifying the great apes have caused the use of the term ''"hominid"'' to vary over time. The original meaning of "hominid" referred only to humans (''Homo'') and their closest extinct relatives. However, by the 1990s humans, apes, and their ancestors were considered to be "hominids". The earlier restrictive meaning has now been largely assumed by the term ''"hominin"'', which comprises all members of the human clade after the split from the chimpanzees (''Pan''). The current meaning of "hominid" includes all the great apes including humans. Usage still varies, however, and some scientists and la ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cladistic
Cladistics (; ) is an approach to biological classification in which organisms are categorized in groups ("clades") based on hypotheses of most recent common ancestry. The evidence for hypothesized relationships is typically shared derived characteristics (synapomorphies'')'' that are not present in more distant groups and ancestors. However, from an empirical perspective, common ancestors are inferences based on a cladistic hypothesis of relationships of taxa whose character states can be observed. Theoretically, a last common ancestor and all its descendants constitute a (minimal) clade. Importantly, all descendants stay in their overarching ancestral clade. For example, if the terms ''worms'' or ''fishes'' were used within a ''strict'' cladistic framework, these terms would include humans. Many of these terms are normally used paraphyletically, outside of cladistics, e.g. as a ' grade', which are fruitless to precisely delineate, especially when including extinct species. R ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Genetic Drift
Genetic drift, also known as allelic drift or the Wright effect, is the change in the frequency of an existing gene variant (allele) in a population due to random chance. Genetic drift may cause gene variants to disappear completely and thereby reduce genetic variation. It can also cause initially rare alleles to become much more frequent and even fixed. When few copies of an allele exist, the effect of genetic drift is more notable, and when many copies exist, the effect is less notable. In the middle of the 20th century, vigorous debates occurred over the relative importance of natural selection versus neutral processes, including genetic drift. Ronald Fisher, who explained natural selection using Mendelian genetics, held the view that genetic drift plays at most a minor role in evolution, and this remained the dominant view for several decades. In 1968, population geneticist Motoo Kimura rekindled the debate with his neutral theory of molecular evolution, which claims that ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
MtDNA
Mitochondrial DNA (mtDNA or mDNA) is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, such as adenosine triphosphate (ATP). Mitochondrial DNA is only a small portion of the DNA in a eukaryotic cell; most of the DNA can be found in the cell nucleus and, in plants and algae, also in plastids such as chloroplasts. Human mitochondrial DNA was the first significant part of the human genome to be sequenced. This sequencing revealed that the human mtDNA includes 16,569 base pairs and encodes 13 proteins. Since animal mtDNA evolves faster than nuclear genetic markers, it represents a mainstay of phylogenetics and evolutionary biology. It also permits an examination of the relatedness of populations, and so has become important in anthropology and biogeography. Origin Nuclear and mitochondrial DNA are thought to be of separate evolutionary origin, with the mtDNA being derived from t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
