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Expert panel dives deep into COVID-19's murky origins

Almost two years after China reported the first known case of COVID-19, experts still cannot confirm how the pandemic began. The journal Science recently convened four experts who debated the likely scenarios.Germ genesisMichael Worobey of the University of Arizona Department of Ecology and Evolutionary Biology sees Mother Nature's hand in SARS-CoV-2's family resemblance to ....

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New Research Helps Explain Diversity of Life and Paradox of Sex

New UArizona research finds that sexual reproduction and multicellularity drive diversity among different species.
By Mikayla Mace Kelley,
University Communications
Wednesday
There are huge differences in species numbers among the major branches of the tree of life. Some groups of organisms have many species, while others have few. For example, animals, plants and fungi each have over 100,000 known species, but most others – such as many algal and bacterial groups – have 10,000 or less.
A new study, published in the Proceedings of the Royal Society B, tested whether sexual reproduction and multicellularity might help explain this mysterious pattern.
We wanted to understand the diversity of life, said paper co-author ....

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Scientists uncover ancient coronavirus epidemic in East Asia

Scientists uncover ancient coronavirus epidemic in East Asia
In a stunning breakthrough that has considerable implications for the current day, scientists have shown that a coronavirus epidemic ravaged East Asia 25,000 years ago. The study published in
Current Biology in June was titled, “An ancient viral epidemic involving host coronavirus interacting genes more than 20,000 years ago in East Asia.”
The research team was led by Yassine Souilmi, of the University of Adelaide Australian Centre of Ancient DNA, along with scientists based in the United States. The study highlights that a coronavirus similar to the SARS-CoV-2 currently ravaging the world, with 191 million people infected and claiming over 4.1 million lives, afflicted humanity many millennia ago. ....

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Methane In The Plumes of Saturn's Moon Enceladus

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July 10, 2021
TUCSON, Ariz. An unknown methane-producing process is likely at work in the hidden ocean beneath the icy shell of Saturn s moon Enceladus, suggests a new study published in Nature Astronomy by scientists at the University of Arizona and Paris Sciences & Lettres University.
Giant water plumes erupting from Enceladus have long fascinated scientists and the public alike, inspiring research and speculation about the vast ocean that is believed to be sandwiched between the moon s rocky core and its icy shell. Flying through the plumes and sampling their chemical makeup, the Cassini spacecraft detected a relatively high concentration of certain molecules associated with hydrothermal vents on the bottom of Earth s oceans, specifically dihydrogen, methane and carbon dioxide. The amount of methane found in the plumes was particularly unexpected. ....

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Methane gas on Saturn's moon Enceladus could indicate the presence of life

Methane gas on Saturn's moon Enceladus could indicate the presence of life
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