Scientists Say Europe Is The Birthplace Of Mankind, Not Africa

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How Do Scientists Date Ancient Things?

Members’ websites Founded in , Science Connection suspended operation April 30th, We are not accepting new members, but existing members can continue to log in and use the site until the end of June. The Science Connection difference: In its year history Science Connection brought together many single science-philes for friendship and romance. Our members are distinguished by their civility, as well as by their brilliance and good humor. Our success stats see to right are exceptional.

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The true benefits—and consequences—of synthetic biology will come as scientists move from mimicking nature in the lab to redesigning it. Imagine plants that change color in the presence of explosives or microbes that can secrete the scent of a long-extinct flower. All of those projects are underway at various stages, and the last target—writing an entire human genome—would be an epochal achievement for science, potentially opening the door to re-engineering the human body itself, making us healthier, smarter, stronger.

A machine tests the tensile strength of biofabricated leather material samples at Modern Meadow. The researchers behind GP-write have made it clear that they have no intention of creating artificial people with their synthesized DNA; rather, their work will be confined to synthesizing human cells, in an effort to better understand how the human genome works—and, potentially, how to make it work better.

But any attempt to engineer the genetic code of living beings raises ethical concerns—first over safety, and even more so, over success. What happens if an engineered plant or animal escapes into the wild, where its impact on the environment would be hard to predict? Engineering human cells to eliminate deadly genetic disorders might seem straightforward, but where would we draw the line between treatment and enhancement? Scientists have yet to fully synthesize the genomes of much simpler single-celled organisms like yeast, so it could take far longer than a decade to learn how to write the 20, or so genes in a human genome.

Dead Scientists 1994-2003

Nicolaus Copernicus to Started the scientific revolution with his book The Revolutions of the Celestial Spheres, explaining his belief that the solar system is centered on the sun, not on the earth. Jacques Cousteau —

Scientists Dating Forum, Barcelona, Spain. likes. The Scientists Dating Forum, an independent think tank, aims at creating bridges between Scientists.

These are K-Ar data obtained on glauconite, a potassium-bearing clay mineral that forms in some marine sediment. Woodmorappe fails to mention, however, that these data were obtained as part of a controlled experiment to test, on samples of known age, the applicability of the K-Ar method to glauconite and to illite, another clay mineral. He also neglects to mention that most of the 89 K-Ar ages reported in their study agree very well with the expected ages.

Evernden and others 43 found that these clay minerals are extremely susceptible to argon loss when heated even slightly, such as occurs when sedimentary rocks are deeply buried. As a result, glauconite is used for dating only with extreme caution. The ages from the Coast Range batholith in Alaska Table 2 are referenced by Woodmorappe to a report by Lanphere and others Whereas Lanphere and his colleagues referred to these two K-Ar ages of and million years, the ages are actually from another report and were obtained from samples collected at two localities in Canada, not Alaska.

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Love-hungry teenagers and archaeologists agree: But while the difficulties of single life may be intractable, the challenge of determining the age of prehistoric artifacts and fossils is greatly aided by measuring certain radioactive isotopes. Until this century, relative dating was the only technique for identifying the age of a truly ancient object. By examining the object’s relation to layers of deposits in the area, and by comparing the object to others found at the site, archaeologists can estimate when the object arrived at the site.

Founded in , Science Connection suspended operation April 30th, The Science Connection difference: In its year history Science Connection brought together many single science-philes for friendship and romance. Our members are distinguished by .

Can you observe evolution happening? Because for many species, humans included, evolution happens over the course of many thousands of years, it is rare to observe the process in a human lifetime. Usually only laboratory scientists studying quickly reproducing life forms, like single-celled creatures and some invertebrates, have the opportunity to see evolutionary change happen before their eyes. All of us can and do experience the indirect effects of evolution nearly every day, however.

One of the more important evolutionary concerns facing humans today is the emergence of antibiotic-resistant microbes. A battle against bacteria that we have been winning with medicine for the last 50 years or so is now an even race, according to some scientists — because of the rapid rate of bacterial evolution.

Similarly, the use of pesticides in agriculture has driven the evolution of resistant insects that require more or harsher chemicals to be killed. Scientists studying Galapagos finches have seen evolutionary changes in beak size and shape in just a few years. Major evolutionary transformations take much, much longer.

Dendrochronology: How Tree-Ring Dating Reveals Human Roots

But the discovery of two fossils believed to be 7. At that time climate change had turned Eastern Europe into an open savannah which forced apes to find new food sources, sparking a shift towards bipedalism, the researchers believe. He is a member of the tribe of hominins and the direct ancestor of homo. Therefore, like humans, he has wide molars and thick enamel.

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Tree-Ring Dating Dendrochronology Dr. Ron Towner from the Laboratory of Tree-Ring Research at the University of Arizona explains the principles behind dendrochronology and why this dating method is valuable to archaeologists. Ron demonstrates how to accurately count tree-rings, and discusses the importance of patterns and master chronologies.

Family trees, the tree of life, getting back to your roots…. But beyond the powerful imagery that trees give us to represent our history, what can trees actually tell us about the past? Dendrochronology is the scientific method of tree-ring dating. Americans first developed it in the early 20th century and now “dendro” is a common method of chronology that is used by scientists all over the world. Dendrochronology has become a fundamental tool in science, for reinforcing and expanding on the timelines of historical and ecological events in the past.

Dendrochronology operates on the principle that in temperate climates, like the southwestern United States, trees grow one ring every year. In the springtime when moisture surges, the cells of a tree expand quickly. Over the course of the summer as the ground becomes more dry, the cells begin to shrink.

New Natural Selection: How Scientists Are Altering DNA to Genetically Engineer New Forms of Life

At the time that Darwin’s On the Origin of Species was published, the earth was “scientifically” determined to be million years old. By , it was found to be 1. In , science firmly established that the earth was 3. Finally in , it was discovered that the earth is “really” 4. In these early studies the order of sedimentary rocks and structures were used to date geologic time periods and events in a relative way. At first, the use of “key” diagnostic fossils was used to compare different areas of the geologic column.

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Share this article Share But the price of progress was smog – urban areas became almost uninhabitable due to poor air quality from the fumes coming out of the factories. The Liverpool University scientists examined black moths from 80 sites across Britain and found they share some key genetic signposts. This led them to identify the region of a chromosome – the equivalent of one page in their genetic code book – as being responsible for the colour change.

Smokestacks from steel factories in Sheffield in the early 19th century The same region is one in which mutations produce hundreds of different wing colour patterns in many species and mutations that control the size of eyespots on butterfly wings. He added however that more research is needed to identify the exact DNA changes which led to the changes in colour. They only account for a few per cent of the total population in England and Wales.

Robert Reed, an evolutionary developmental biologist at the University of California, who was not involved in the study, said:

Are Men Less Likely to Date Smart Women?