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Surprisingly old stone points found in a Mexican cave are the latest intriguing discovery among many to raise questions about when humans really arrived in the Americas. For most of the 20th century archaeologists generally agreed that humans who had crossed the Beringia land bridge from Siberia to North America only ventured further into the continent only when retreating ice sheets opened a migration corridor, about 13, years ago. Put forth by Ciprian Ardelean , an archaeologist at the Autonomous University of Zacatecas Mexico , and his colleagues, the new paper suggests people were living in central Mexico at least 26, years ago. Data from those sites were used to model a much earlier peopling of the Americas, and help scientists reimagine not only when but how the first people reached and populated the New World. The model features a number of archaeological sites, including Chiquihuite cave, which are intriguing but controversial enough, as experts disagree whether the sites actually evidence human occupation. Chiquihuite cave is perched high in the Astillero Mountains, feet above sea level and 3, feet higher than the valley below. Excavations there were launched when a test pit unearthed a few stone artifacts that suggested a human presence dating back to the Last Glacial Maximum between 18, and 26, years ago. More extensive excavations detailed in the new study were carried out in and , unearthing some 1, stone points or possible tools used for cutting, chopping, scraping, or as weapons. The artifacts were dated by 46 different radiocarbon samples of adjacent animal bones, charcoal, and sediment samples.

Dating app based on genetic matching not eugenics, scientist says

Carbon dating , also called radiocarbon dating , method of age determination that depends upon the decay to nitrogen of radiocarbon carbon Radiocarbon present in molecules of atmospheric carbon dioxide enters the biological carbon cycle : it is absorbed from the air by green plants and then passed on to animals through the food chain.

Radiocarbon decays slowly in a living organism, and the amount lost is continually replenished as long as the organism takes in air or food. Once the organism dies, however, it ceases to absorb carbon, so that the amount of the radiocarbon in its tissues steadily decreases.

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This particular report focuses on the patterns, experiences and attitudes related to digital technology use in romantic relationships. These findings are based on a survey conducted Oct. The margin of sampling error for the full sample is plus or minus 2. Recruiting ATP panelists by phone or mail ensures that nearly all U. This gives us confidence that any sample can represent the whole U.

To further ensure that each ATP survey reflects a balanced cross-section of the nation, the data is weighted to match the U. You can also find the questions asked, and the answers the public provided in the topline. Amid growing debates about the impact of smartphones and social media on romantic relationships, a Pew Research Center survey conducted in October finds that many Americans encounter some tech-related struggles with their significant others.

For instance, among partnered adults in the U. Partnered adults under the age of 50 are particularly likely to express the feeling that their partner is distracted by their phone, with those ages 30 to 49 most likely to report this.

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Subscribers to the print edition have free access to all articles and the archive of past content that has so far been digitised. Online readership takes various forms. Overall free views of an elite database of best , articles are On social media there are 3. New Scientist has published books derived from its content, online of which are selected questions and answers from the Last Word section of the account and website:.

Rocket Scientist Kicked Off Dating Site. A New Jersey man found his quickly terminated despite following the rules. Lynda Baquero.

Fossilized roots dating back to million years ago, in Cairo, New York. The researchers say the new site is evidence that forests developed 2 to 3 million years earlier than previously thought. The findings were published recently in the journal Current Biology. The site, located in the town of Cairo, New York, has three unique root systems — evidence that ancient forests were comprised of several different tree species.

The first species scientists identified was a palm tree-like plant called Eospermatopteris , which has short roots that lived for a year or two before dying and growing new ones, according to a press release. They also found fossils of a tree called Archaeopteris , which shares several traits with modern conifers. Trees in Archaeopteris genus later became the first to evolve flat, green leaves, New Scientist reported.

Although still dramatically different than modern trees, Archaeopteris nevertheless seems to point the way toward the future of forests. At the time this ancient forest existed, no birds or vertebrates lived on land. Instead, the forest was likely home to millipede-like bugs and other insects. Just the wind in the trees. They captured carbon dioxide, bringing levels down similar to modern times, and helped to significantly cool the planet.

Scientists say this latest discovery could help provide clues about the relationship between deforestation and modern climate change. By Jon Hurdle.

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Yes, a dating site for Apple fans does exist, and guess what? It’s purposefully designed to cost users the price of a venti Mocha from Starbucks each month. No more queuing in line on your lonesome for the next iThing — food runs and toilet breaks are back on the iQueue menu.

By contrast, they later reported, humans do birth new neurons in an area called the striatum, where new cells are rarely found in other animal.

Radiocarbon dating, invented in the late s and improved ever since to provide more precise measurements, is the standard method for determining the dates of artifacts in archaeology and other disciplines. Manning is lead author of a new paper that points out the need for an important new refinement to the technique. The outcomes of his study, published March 18 in Science Advances , have relevance for understanding key dates in Mediterranean history and prehistory, including the tomb of Tutankhamen and a controversial but important volcanic eruption on the Greek island of Santorini.

Radiocarbon dating measures the decomposition of carbon, an unstable isotope of carbon created by cosmic radiation and found in all organic matter. Cosmic radiation, however, is not constant at all times. To account for fluctuations of cosmic radiation in the Earth’s atmosphere, the radiocarbon content of known-age tree rings was measured backward in time from the 20th century, for thousands of years. Tree-ring calibrated radiocarbon started to be widely used 50 years ago.

A standard calibration curve was introduced in and is updated every few years as more data are added. In their study, Manning and co-authors question the accuracy of a single calibration curve for all of the Northern Hemisphere. Using data collected by only one lab to control for interlaboratory variation, they compared radiocarbon data from northern Europe Germany and from the Mediterranean central Turkey in the 2nd and 1st millennia B.

They found that some small but critical periods of variation for Mediterranean radiocarbon levels exist.

Isotopic Bomb Traces Are a Boon to Biological Dating

New Scientist , first published on 22 November , is a weekly English-language magazine that covers all aspects of science and technology. It has been available online since New Scientist also publishes speculative articles, ranging from the technical to the philosophical. Reed retained the magazine when it sold most of its consumer titles in a management buyout to what is now TI Media.

Originally, the cover of New Scientist listed articles in plain text.

Date a Real Scientist! D writes on why people struggle to let go and identifies the 3 common factors preventing people from moving on. Our online customer care.

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It has also quietly made a hire that points to its growing interest in developing more specific uses of its data, although not for the dating feature specifically. Dr Steve Carter, a data scientist who helped design and build the psychometric and relationship models that became the basis of eHarmony — the dating site where he was a founding member and worked for nearly 20 years — is working at the social network, out of its offices in Los Angeles.

But Facebook has confirmed to us that Carter is not working on the new dating service, and the company declined to say what he is doing. His LinkedIn profile notes that he joined Facebook in August His expertise lies squarely in building matchmaking algorithms.

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It is not often that the general public has opportunity to informally chat with scientists, engineers, and social scientists; nor is it often that scientists, engineers, and social scientists get the opportunity to discuss their work with the general public in a social environment. This program facilitates these kinds of interactions in a thought-provoking and exciting forum.

Have questions about nanoscale science and engineering immediately answered by scientists and engineers actively working in the field; as well as consider questions about the societal and ethical implications with social scientists. Hear questions from other participants, having their own interest and understanding broadened based on questions they had not previously considered. Discover that scientists often have questions of the general public, and perhaps be able to provide invaluable feedback to scientists and engineers as they continue their work.

Any opinions, findings, and conclusions or recommendations expressed in this product are those of the authors and do not necessarily reflect the views of the Foundation. View more details. Scientist Speed Dating is a facilitated, yet informal and high-energy, social activity to encourage a large group of people to speak with one another, ask questions, and learn about specific areas of research and practice within the field of nanoscale science and engineering, as well as the related societal and ethical implications of work in this field.

Carbon dating, the archaeological workhorse, is getting a major reboot

Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Researchers use data from tree rings, sediment layers and other samples to calibrate the process of carbon dating.

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