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.
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.
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.
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.
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”.
Chadian paleontologist Clarisse Nekoulnang said the team was “trying to find sites older than that of Toumai”.
International
King Charles III Says U.S.-UK Alliance Is “Irreplaceable and Unbreakable”
King Charles III of the United Kingdom reaffirmed the strength of the British-American relationship on Tuesday during a speech before the United States Congress, describing the alliance between the two nations as “irreplaceable and unbreakable.”
The address, delivered at the Capitol, marked the first speech by a British monarch before Congress since Queen Elizabeth II in 1991 and comes at a time of political tensions between Donald Trump’s administration and the Labour government of Prime Minister Keir Starmer.
“As President Trump himself observed during his state visit to Britain last autumn, the bond of kinship and identity between the United States and the United Kingdom is invaluable and eternal. It is irreplaceable and unbreakable,” the king said.
While reflecting on the upcoming 250th anniversary of U.S. independence, which will be commemorated this year, Charles III stated that the partnership between the two countries “was born out of disagreement, but is no less strong because of it.”
The monarch emphasized the democratic values shared by both nations and noted that major global changes have occurred whenever the two allies found common ground.
“When we have found that way to agree, great changes have taken place not only for the benefit of our peoples, but for all peoples,” he said.
King Charles also quoted British Prime Minister Keir Starmer, who recently described the relationship as “an indispensable alliance.”
Concluding his speech, the monarch described the shared history of the United States and the United Kingdom as “a story of reconciliation, renewal, and an extraordinary partnership.”
He added that Washington and London have forged “one of the most consequential alliances in human history.”
“I pray with all my heart that our alliance continues to defend our shared values, together with our partners in Europe, the Commonwealth, and around the world, and that we ignore calls urging us to become increasingly isolationist,” Charles III stated.
The king ended by urging both nations to “recommit to one another in selfless service to our peoples and to all peoples of the world.”
International
Trump Administration Considers Denying Green Cards Over Political Views
The administration of President Donald Trump is evaluating new immigration guidelines that could deny permanent residency to immigrants based on their political views, according to a report published by The New York Times.
The proposed measures, outlined in internal Department of Homeland Security documents, would instruct immigration officials to take applicants’ public expressions and ideological positions into account when reviewing green card applications.
According to the report, cases involving “possible anti-American and/or antisemitic conduct or ideologies” would need to be referred to higher authorities for additional review.
Even if applicants have not violated any laws, authorities could still reject residency requests if they determine that individuals have “endorsed, promoted, or supported anti-American views.”
Among the factors listed in the guidelines are participation in pro-Palestinian activities, actions considered antisemitic, and the burning of the U.S. flag.
The documents reportedly describe such actions as “heavily negative” factors in immigration evaluations, potentially blocking applicants from obtaining permanent residency and, eventually, U.S. citizenship.
The directives also place particular attention on demonstrations held on university campuses following the 2023 Hamas attacks against Israel.
However, flag burning has previously been recognized by the U.S. Supreme Court as a form of protected free speech under the Constitution.
The proposal has sparked criticism from immigrant advocacy organizations, including the New York Immigration Coalition.
Its president, Murad Awawdeh, warned that the policies could pose a threat to fundamental rights and freedoms.
International
Mexico Arrests CJNG Leader “El Jardinero” in Nayarit
Mexican authorities arrested Audias Flores, known as “El Jardinero,” on Monday during a naval operation in the western state of Nayarit, delivering another major blow to the Cártel Jalisco Nueva Generación (CJNG).
Flores was considered one of the top regional leaders within the cartel and had reportedly overseen criminal operations along Mexico’s Pacific coast. Security analysts viewed him as a potential successor to slain drug kingpin Nemesio Oseguera.
The arrest was carried out by Mexico’s Navy Special Forces in a planned operation, according to Security Minister Omar García Harfuch.
The United States Department of the Treasury had previously identified Flores as a “significant foreign narcotics trafficker,” while U.S. authorities offered a reward of up to $5 million for information leading to his capture and extradition.
A U.S. grand jury indicted Flores in 2021 on charges including conspiracy to distribute cocaine and heroin.
His capture comes months after the reported death of “El Mencho,” an operation that Mexican authorities considered a priority due to the cartel leader’s alleged involvement in a 2020 assassination attempt against García Harfuch.
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