Saturday, April 17, 2021

Fact Check

On whether he supports the filibuster.

North Carolina State Sen. Jeff Jackson, a Democrat, speaks to Spectrum News anchor Tim Boyum about his U.S. Senate campaign on Jan. 26, 2021.Source...

President Joe Biden’s American Relief Plan “has a lot of money in it for schools, but if you really look at it … it...

Kindergarten students at Maurice Sendak Elementary School in Los Angeles on April 13, 2021. (AP)Source link

"Kids in cages" in border facilities are "at 700% capacity."

Newly arrived migrant children inside a temporary federal facility for unaccompanied minors in Donna, Texas, on March 30, 2021. (APSource link

NO FUE REAL: Una mirada a lo que no sucedió esta semana

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“There is racism physically built into some of our highways.”

The Overtown neighborhood in Miami, Fla. (Pietro, Creative Commons)Source link

NOT REAL NEWS: A look at what didn’t happen this week

A roundup of some of the most popular but completely untrue stories and visuals of the week. None of these are legit, even though...

US Politics
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Biden seeks a new view of infrastructure, far beyond asphalt

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Cruz, Hawley dwarf potential 2024 rivals in fundraising

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Biden administration blocks Medicaid work requirements

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Cash floods into battle for control of Congress

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Biden returns prisoner-of-war flag to perch atop White House

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LGBTQ

Former NFL player Ryan Russell takes strong stand for trans youth who want to play sports / LGBTQ Nation

Out NFL veteran and writer Ryan K. Russell has spoken out against the wave of anti-trans legislation that seeks to prevent trans youth from...

Congressman André Carson champions LGBTQ rights. This is why. / LGBTQ Nation

The latest episode of the LGBTQ Nation podcast has arrived and we’ve got an extra special show this week. Congress member André Carson (D-IN) joins host...

Colton Underwood’s coming out could finally give us a gay Bachelor season / LGBTQ Nation

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Tech

New this Week: ‘Kung Fu,’ ‘Rebel’ and ‘Thunder Force’

New this Week: ‘Kung Fu,’ ‘Rebel’ and ‘Thunder Force’ Source link

Man pleads no contest to killing woman in Great Falls motel

GREAT FALLS, Mont. (AP) — A man who pleaded no contest to deliberate homicide for killing a woman at a Great Falls motel in...

More than 45,000 years ago, modern humans ventured into Neanderthal territory. Here’s what happened next

Must read

Biden seeks a new view of infrastructure, far beyond asphalt

WASHINGTON (AP) — President Joe Biden is giving himself lots of latitude when he defines infrastructure for the purpose of spending money on it....

Cruz, Hawley dwarf potential 2024 rivals in fundraising

The next two top performers — who will both be on the ballot next year — were Sens. Rand Paul (R-Ky.) and Marco Rubio...

Biden administration blocks Medicaid work requirements

MADISON, Wis. (AP) — President Joe Biden’s administration has blocked former Gov. Scott Walker’s plan to require some childless adults to work to maintain...

On whether he supports the filibuster.

North Carolina State Sen. Jeff Jackson, a Democrat, speaks to Spectrum News anchor Tim Boyum about his U.S. Senate campaign on Jan. 26, 2021.Source...

This skull from Zlatý kůň cave near Prague belonged to the earliest known modern human in Europe.

MAREK JANTAČ

The four-story labyrinth of galleries in Bulgaria’s Bacho Kiro cave has long been a magnet for all sorts of humans. Neanderthals came first, more than 50,000 years ago, and left their characteristic Mousterian stone tools among the stalagmites. Next came modern humans in at least two waves; the first littered the cave floor with beads and stone blades stained with ochre, about 45,000 years ago. Another group settled in about 36,000 years ago with even more sophisticated artifacts.

Now, a new ancient DNA study shows the first group of modern humans at Bacho Kiro carried a recent legacy from Neanderthals: Those people’s ancestors had interbred with our extinct cousins as recently as six generations, or 160 to 180 years, previously.

However, another study out today, of what may be the oldest modern human in Europe, shows the first wave of moderns had diverse Neanderthal legacies. The genome of a dark-skinned, brown-haired, brown-eyed woman from Zlatý kůň cave in the Czech Republic included only 3% Neanderthal DNA, which likely came from a long-ago tryst in the Middle East, not from recent contact, the study suggests.

Taken together, these genomic snapshots offer a glimpse into the identities of the mysterious modern humans who first set foot in Europe and their relationship to Neanderthals, who vanished about 40,000 years ago. “You’re talking about multiple waves of modern humans,” says paleoanthropologist Chris Stringer of the Natural History Museum in London. “Some groups mixed with Neanderthals, and some didn’t. Some are related to later humans and some are not.”

The new revelations fill out the story of these ancient encounters, says Mateja Hajdinjak, a postdoc at the Max Planck Institute for Evolutionary Anthropology (MPI) and an author of the Bacho Kiro study. “For the first time, we’re getting ancient DNA from multiple early modern humans that tells us so much about their interactions with some of the very last Neanderthals in Europe,” she says.

After modern humans trekked out of Africa 60,000 to 80,000 years ago, they interbred at least once with Neanderthals, most likely in the Middle East about 50,000 years ago, previous ancient DNA research has shown. Those studies include analyses of two early modern humans from Eurasia: a 45,000-year-old thigh bone of a man from Ust’-Ishim in Siberia, and the jawbone of a young man from Petştera cu Oase cave in Romania, dated to between 37,000 and 42,000 years ago. The Oase man inherited as much as 6.4% of his DNA from a recent Neanderthal ancestor. But he lived at least 5000 years after modern humans had arrived in Europe. Today’s studies offer a genetic glimpse of an earlier time, when modern humans first ventured into Neanderthal territory.

Hajdinjak and MPI paleogeneticist Svante Paabo analyzed genomes from Bacho Kiro, where last year researchers used a new protein-based method to show that bone fragments in a middle layer of cave sediments came from modern humans. In the new study, the researchers sequenced genomes from a molar and bone fragments from that middle layer and directly dated them to 42,580 to 45,930 years ago. They also sequenced DNA from bone found in a younger layer and dated it to 35,000 years ago. Remains from both layers were modern humans, but from different populations, they report in Nature today.

The genomes show the three oldest modern humans at Bacho Kiro were distantly related to a 40,000-year-old partial skeleton from Tianyuan in China, as well as to other ancient and living East Asians and Native Americans. That suggests they all descended from an early population that once spread across Eurasia, but whose descendants in Europe seem to have died out. The lineage survived in Asia, later giving rise to people who migrated to America.

Modern humans on the move

New genomes from two sites (red) add to the handful of ancient DNA studies of the mysterious modern humans who first ventured into Eurasia and the heart of the Neanderthal.