International

Oldest human relative walked upright 7 mn years ago: study

AFP

The earliest known human ancestor walked on two feet as well as climbing through trees around seven million years ago, scientists said Wednesday after studying three limb bones.

When the skull of Sahelanthropus tchadensis was discovered in Chad in 2001, it pushed back the age of the oldest known representative species of humanity by a million years.

Nicknamed “Toumai”, the nearly complete cranium was thought to indicate that the species walked on two feet because of the position of its vertebral column and other factors.

However the subject triggered fierce debate among scientists, partly due to the scarcity and quality of the available bones, with some even claiming that Toumai was not a human relative but just an ancient ape.

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In a study published in the Nature journal on Wednesday, a team of researchers exhaustively analysed a thigh bone and two forearm bones found at the same site as the Toumai skull.

“The skull tells us that Sahelanthropus is part of the human lineage,” said paleoanthropologist Franck Guy, one of the authors of the study.

The new research on the limb bones demonstrates that walking on two feet was its “preferred mode of getting around, depending on the situation,” he told a press conference.

But they also sometimes moved through the trees, he added.

– ‘Not a magical trait’ –

The leg and arm bones were found alongside thousands of other fossils in 2001, and the researchers were not able to confirm that they belonged to the same individual as the Toumai skull.

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After years of testing and measuring the bones, they identified 23 characteristics which were then compared to fossils from great apes as well as hominins — which are species more closely related to humans than chimpanzees.

They concluded that “these characteristics are much closer to what would be seen in a hominin than any other primate,” the study’s lead author Guillaume Daver told the press conference.

For example, the forearm bones did not show evidence that the Sahelanthropus leaned on the back of its hands, as is done by gorillas and chimpanzees.

The Sahelanthropus lived in an area with a combination of forests, palm groves and tropical savannahs, meaning that being able to both walk and climb through trees would have been an advantage.

There have been previous suggestions that it was the ability to walk on two feet that drove humans to evolve separately from chimpanzees, putting us on the path to where we are today.

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However the researchers emphasised that what made Sahelanthropus human was its ability to adapt to its environment.

“Bipedalism (walking on two legs) is not a magical trait that strictly defines humanity,” paleontologist Jean-Renaud Boisserie told the press conference.

“It is a characteristic that we find at the present time in all the representatives of humanity.”

– Our ‘bushy’ family tree –

Paleoanthropologist Antoine Balzeau of France’s National Museum of Natural History said the “extremely substantial” study gives “a more complete image of Toumai and therefore of the first humans”.

It also bolstered the theory that the human family tree is “bushy”, and was not like the “simplistic image of humans who follow one another, with abilities that improve over time,” Balzeau, who was not involved in the research, told AFP.

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Daniel Lieberman, a professor of human evolutionary biology at Harvard University, said in a linked paper in Nature that the study’s “authors have squeezed as much information as possible from the fossil data”.

But he added that the research will not offer “full resolution” of the debate.

Milford Wolpoff, a paleoanthropologist at the US University of Michigan cast doubt on whether Toumai is a hominin, telling AFP that “extraordinary claims require extraordinary evidence”.

Wednesday’s study was carried out by researchers from the PALEVOPRIM paleontology institute, a collaboration between France’s CNRS research centre and Poitiers University, as well as scientists in Chad.

Guy said the team hopes to continue its research in Chad next year — “security permitting”.

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Chadian paleontologist Clarisse Nekoulnang said the team was “trying to find sites older than that of Toumai”.

International

Federal immigration agents kill man in Minneapolis, sparking protests and outrage

Federal immigration agents shot and killed a 37-year-old Minneapolis man during an operation on Saturday, authorities confirmed, sparking new protests and deepening outrage over federal immigration enforcement in the city.

The victim, identified as Alex Jeffrey Pretti, was a U.S. citizen and intensive care nurse who worked at a Veterans Affairs hospital and was widely respected in his community, according to colleagues and news reports.

Officials said the shooting occurred during a targeted immigration raid in south Minneapolis. The Department of Homeland Security (DHS) described the incident as an act of self-defense by agents who believed the man posed a threat.

However, videos reviewed by multiple outlets and eyewitnesses show Pretti holding a phone and not displaying a weapon before being pepper-sprayed, tackled by agents and then shot multiple times, raising serious questions about the official account.

The killing comes amid a broader federal immigration enforcement operation in the city and follows another controversial shooting in early January in which Renée Good, a 37-year-old U.S. citizen, was fatally shot by an ICE agent, leading to widespread protests and criticism of federal tactics.

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International

Delcy Rodríguez seeks political agreements after Maduro’s ouster

Venezuela’s interim president, Delcy Rodríguez, on Saturday called for “reaching agreements” with the opposition to achieve “peace” in the country, which the United States says it now controls following the military operation that removed President Nicolás Maduro from power.

Rodríguez, who previously served as Maduro’s vice president, assumed interim leadership after the leftist leader was captured on January 3 during a military incursion that left nearly 100 people dead.

In her first public statements since taking office, Rodríguez signaled a shift in the strained relationship between Caracas and Washington, while also committing to the release of a “significant number” of political prisoners.

“There can be no political or partisan differences when it comes to the peace of Venezuela,” Rodríguez said during an address in the coastal state of La Guaira, broadcast on state television VTV.

“From our differences, we must speak to one another with respect. From our differences, we must meet and reach agreements,” she added.

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The day before, Rodríguez instructed the head of Parliament — her brother Jorge Rodríguez — to convene talks with various political sectors in the country aimed at achieving “concrete and immediate results.”

International

Bogotá and Quito Seek Dialogue After Tariffs and Power Cut Escalate Tensions

Bogotá and Quito will hold an emergency bilateral summit next week amid recent developments that have strained relations between the two countries.

Tensions escalated this week after Ecuadorian President Daniel Noboa unexpectedly announced a 30% tariff on Colombian imports. Colombia responded with a reciprocal measure, imposing the same tariff on around 20 Ecuadorian products and suspending electricity exports to Ecuador.

Aware that electricity imports are critical to easing Ecuador’s recent energy crises, Quito further imposed a 30% tariff on the transportation of Colombian oil through its territory.

However, recent statements from the Ecuadorian government suggest that dialogue between the two sides has intensified in recent hours. Ecuador’s Minister of Foreign Affairs, Gabriela Sommerfeld, confirmed that active conversations are under way.

In Colombia, segments of the business sector have welcomed the prospect of negotiations. The National Business Council (Consejo Gremial Nacional, CGN), for instance, urged both governments to restore commercial relations, warning that the dispute “puts jobs and regional economic stability at risk.”