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

Young Spanish Woman Receives Euthanasia After Legal Battle, Sparking Debate

A 25-year-old Spanish woman, Noelia Castillo, received euthanasia on Thursday following a prolonged legal dispute with her father.

She passed away at a care center in Sant Pere de Ribes, about 40 kilometers from Barcelona, where she had been living for some time, according to Spanish media reports.

In an interview broadcast a day earlier on Antena 3, Castillo expressed her exhaustion after enduring prolonged suffering. She indicated that her decision was influenced by a combination of personal circumstances and health-related challenges, including family conflicts and a condition of paraplegia following a previous incident that left her with lasting physical consequences.

Spain legalized euthanasia in 2021, becoming one of the few countries that allow patients under strict conditions to seek medical assistance to end their lives in order to avoid what the law defines as unbearable suffering.

The case has reignited debate in Spain over the ethical, legal, and family dimensions surrounding euthanasia, as well as the broader issue of support for individuals in vulnerable situations.

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International

Over 300 U.S. Troops Wounded Since Start of Iran Conflict, CENTCOM Says

More than 300 U.S. service members have been injured since the start of the conflict with Iran on February 28, the United States Central Command confirmed on Friday.

“Since the beginning of Operation Epic Fury, approximately 303 U.S. service members have been wounded. The vast majority of these injuries are minor, and 273 troops have already returned to duty,” said U.S. Navy Captain Tim Hawkins.

A U.S. official, speaking on condition of anonymity to AFP, indicated that 10 American troops remain seriously injured.

According to the latest figures, an additional 13 U.S. service members have been killed since the conflict began, including seven in the Gulf region and six in Iraq.

Meanwhile, Iran’s armed forces warned on Friday that hotels hosting U.S. troops in the region could be considered legitimate military targets.

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“When U.S. forces enter a hotel, from our perspective that hotel becomes American,” said armed forces spokesperson Abolfazl Shekarchi in remarks broadcast on state television.

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.