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IMAGE: Recently collected cores sit in the back of an old truck after they were drilled from an ancient lake bed in Afar, Ethiopia. view more
Credit: Sarah Ivory, Penn State
Ancient pollen samples and a new statistical approach may shed light on the global rate of change of vegetation and eventually on how much climate change and humans have played a part in altering landscapes, according to an international team of researchers. We know that climate and people interact with natural ecosystems and change them, said Sarah Ivory, assistant professor of geosciences and associate in the Earth and Environmental Systems Institute, Penn State. Typically, we go to some particular location and study this by teasing apart these influences. In particular, we know that the impact people have goes back much earlier than what is typically accepted as the case. However, we haven t been able to observe the patterns created by these processes globally or long-term.
Horsetalk.co.nz Gene flow between Eurasian and North American horses revealed by ancient DNA
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Ancient horses crossed over the Bering Land Bridge in both directions between North America and Asia multiple times during the Pleistocene. Image: Julius Csotonyi
Analysis of ancient horse DNA reveals the gene flow between horse populations in North America, where they evolved, and Eurasia, where they were domesticated.
The study of DNA from horse fossils shows that horse populations on the two continents remained connected through the Bering Land Bridge, moving back and forth and interbreeding multiple times over hundreds of thousands of years.
MIT researchers and colleagues have turned a “magic” material of atomically thin graphene into three useful electronic devices. All are key to the quantum electronics industry.
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