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

Ninth Victim Recovered After Deadliest U.S. Avalanche in Decades

Rescue teams in California on Saturday recovered the body of the ninth and final victim of a deadly avalanche in the Sierra Nevada mountains, according to the local sheriff’s office.

The avalanche struck a group of 11 skiers and four guides on Tuesday as they were returning from a three-day backcountry trip near Castle Peak, a 2,777-meter (9,111-foot) mountain and popular tourist destination on the U.S. West Coast.

Six people were rescued alive on Tuesday. Authorities said the incident marks the deadliest avalanche in the United States since 1981.

“All nine individuals who lost their lives in the February 17 Castle Peak avalanche have been safely recovered from the mountain,” the Nevada County Sheriff’s Office said in a statement.

“There are no words that can truly capture the magnitude of this loss, and our hearts grieve alongside the families affected by this catastrophic event,” Sheriff Shannan Moon said.

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Officials had warned on Thursday that search operations would likely continue through the weekend due to severe weather conditions in the area.

Survivors were able to call for help shortly after the avalanche occurred. However, near-zero visibility and the risk of additional snow slides prevented rescue teams from reaching them for several hours.

International

Trump Defies Supreme Court With New 10% Global Tariff

Defiant in the face of a judicial setback, Donald Trump on Friday imposed a new across-the-board 10% tariff after the Supreme Court of the United States ruled that he does not have the authority to levy customs duties under the guise of a national emergency.

The Republican president signed the order in the Oval Office and announced on social media that the measure would take effect “almost immediately.” According to a statement from the White House, the decree will formally enter into force on February 24 for a period of 150 days.

It remains unclear whether the new tariff will apply to countries that have already negotiated trade agreements establishing rates higher than 10%.

Earlier in the day, the conservative-majority court ruled that a 1977 law cited by Trump to abruptly impose tariffs on individual countries — disrupting global trade — “does not authorize the president to impose tariffs.”

Trump said he was “deeply disappointed” by the decision and accused some justices of being influenced by “foreign interests.”

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Although he has made variable tariffs a cornerstone of his foreign policy, Trump acknowledged that it is uncertain whether the government will have to refund revenue already collected. A study by the University of Pennsylvaniaestimated that the amount at stake could reach as much as $175 billion.

“That issue was not addressed by the Court,” Trump told reporters, warning that the legal battle could drag on for “years.”

Justice Brett Kavanaugh, who dissented from the Court’s 6–3 majority opinion, cautioned that the legal process could become a “mess.”

Trump denied any error or haste in using tariffs as a policy tool, arguing instead that the six justices who ruled against him were motivated by “political correctness.” Vice President JD Vance wrote on X that the Court had acted “outside the law.”

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International

U.S. Targets Members of Outgoing Boric Administration With Visa Revocations

The United States government announced on Friday the revocation of visas for three Chilean officials—whose identities were not initially disclosed—citing activities that allegedly “undermined regional security,” an accusation that Chile denies.

In a statement, the U.S. Department of State did not provide specific details about the individuals involved but criticized the outgoing administration of leftist President Gabriel Boric.

“The legacy of the Boric government will be further tarnished by actions that undermine regional security to the ultimate detriment of the Chilean people,” the statement read. It was signed by U.S. Secretary of State Marco Rubio.

Chile’s Minister of Transport, Juan Carlos Muñoz, later confirmed in a video message to the press that he is among those sanctioned.

“I was recently informed that my visa to enter the United States has been revoked by that country, which I deeply regret,” Muñoz said.

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The U.S. statement also noted that Washington hopes to “advance shared priorities, including those that strengthen security in our hemisphere, with the upcoming Kast government.”

The electoral victory of ultraconservative leader José Antonio Kast was welcomed in Washington, which has been building alliances with like-minded governments in the region to reinforce its diplomatic and economic agenda—particularly in response to China’s growing investment presence in Latin America.

“We remain committed to promoting accountability for Chilean individuals who deliberately work to destabilize our hemisphere,” the statement concluded.