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

Iran rejects negotiations as tensions escalate with United States

Iran has no intention of entering negotiations and will continue to resist, Foreign Minister Abbas Araghchi said Wednesday night, dismissing recent statements by U.S. President Donald Trump about possible talks.

Speaking to state television, Araghchi argued that Washington’s call for negotiations reflects a position of weakness. He added that the Islamic Republic seeks to end the war on its own terms, ensuring that such a conflict does not recur in the future.

Meanwhile, the White House issued a stark warning, stating that Trump would “unleash hell” on Iran if it refuses to accept a deal to end the conflict. Despite Tehran’s rejection, U.S. officials maintained that discussions remain ongoing.

White House spokesperson Karoline Leavitt reinforced the administration’s position, warning that failure to acknowledge what she described as Iran’s military defeat would result in even stronger action from Washington.

The increasingly aggressive rhetoric from both sides has diminished hopes for a near-term de-escalation in the conflict, which began following U.S. and Israeli strikes against Iran on February 28.

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As tensions continue to rise, the prospect of a diplomatic resolution remains uncertain amid conflicting narratives and escalating threats from both governments.

International

Maduro appears again in New York court amid drug trafficking charges

Ousted Venezuelan president Nicolás Maduro appeared in a New York federal court on Thursday for the second time since his capture on January 3 during a U.S. military operation in Caracas.

Maduro, 63, and his wife, Cilia Flores, 69, have been held in a detention facility in Brooklyn for nearly three months. Their only previous court appearance took place on January 5, when Maduro declared himself a “prisoner of war” and pleaded not guilty to drug trafficking charges.

A large police convoy departed the detention center early in the morning, heading toward the federal courthouse in Manhattan, where the hearing was scheduled. Security around the building was reinforced as both supporters and opponents gathered outside.

Among those present was Venezuelan educator Carlos Egana, who expressed frustration and called for justice, reflecting the polarized reactions surrounding the case. At the same time, left-wing activists displayed banners demanding Maduro’s release and criticizing U.S. foreign policy.

Maduro governed Venezuela from 2013 until his removal from power earlier this year. Following his ouster, Delcy Rodríguez assumed the interim presidency, initiating a shift in relations with the United States.

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The former leader faces multiple charges, including narco-terrorism conspiracy, cocaine importation, and illegal possession of weapons.

During Thursday’s hearing, scheduled for 11:00 a.m. local time, Maduro’s legal team was expected to push for the dismissal of the case, while also addressing disputes over how his legal defense will be financed amid ongoing U.S. sanctions.

His lawyer, Barry Pollack, has argued that restrictions on accessing Venezuelan state funds could affect Maduro’s right to legal representation, adding another layer of complexity to a case with significant political and international implications.

International

German president says trust in U.S. leadership is ‘lost’ amid global tensions

German President Frank-Walter Steinmeier said on Tuesday that trust between the United States and its Western allies has been “lost,” warning that the damage could persist beyond the presidency of Donald Trump.

“The rupture is very deep, and the loss of trust in U.S. great power policy is significant—not only among its allies, but also, as I observe, globally,” Steinmeier said during a speech in Berlin marking the 75th anniversary of Germany’s Foreign Ministry.

Referring to the future of transatlantic relations, he stated that “there is no return to the situation before January 20, 2025,” the date marking the start of Trump’s second term in the White House.

“Even a future U.S. administration will no longer be able to resume the role of a benevolent hegemon guaranteeing a liberal international order,” added Steinmeier, who previously served as Germany’s foreign minister.

He also criticized the war against Iran, describing it as “contrary to international law” and calling it “a political mistake with serious consequences.”

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“This war is avoidable and unnecessary,” he said.

Although the German presidency is largely ceremonial, Steinmeier’s remarks reflect a broader concern within Germany, aligning with the government’s cautious stance while going further in tone.