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
Paraguay summons Brazilian ambassador over Itaipú espionage scandal

Paraguay summoned the Brazilian ambassador in Asunción on Tuesday to demand “explanations” and called its own representative in Brasília for consultations following Brazil’s acknowledgment of an espionage operation. The Brazilian government, led by President Luiz Inácio Lula da Silva, attributed the operation to the previous administration.
The surveillance effort aimed to uncover Paraguay’s position in now-suspended negotiations with Brazil regarding the pricing of electricity from the binational Itaipú hydroelectric plant, according to reports in the Brazilian press.
The Brazilian government “categorically denied any involvement in the intelligence operation,” stating in a Foreign Ministry communiqué on Monday that the espionage was carried out under former President Jair Bolsonaro’s administration (2019-2023).
“The operation was authorized by the previous government in June 2022 and was annulled by the interim director of the (state intelligence agency) ABIN on March 27, 2023, as soon as the current administration became aware of it,” Brazil’s government asserted.
Paraguay’s Foreign Minister Rubén Ramírez announced that Brazilian Ambassador José Antonio Marcondes de Carvalho was summoned “to provide detailed explanations” regarding the operation. Additionally, Paraguay recalled its diplomatic representative in Brasília “to report on aspects related to the intelligence activity conducted by Brazil regarding Paraguay’s government affairs.”
International
Elon Musk to step down as government advisor, per Trump insiders

President Donald Trump has informed his inner circle that Elon Musk will be stepping down from his role as a government advisor, according to a report by Politico today.
Citing three individuals close to Trump, Politico states that the president is pleased with Musk’s leadership at the Department of Government Efficiency (DOGE), where he has implemented significant budget cuts. However, both have agreed that it is time for Musk to return to his businesses and support Trump from a different position outside the government.
A senior administration official told Politico that Musk will likely maintain an informal advisory role and continue to be an occasional visitor to the White House. Another source warned that anyone thinking Musk will completely disappear from Trump’s circle is “deluding themselves.”
According to the sources, this transition is expected to coincide with the end of Musk’s tenure as a “special government employee,” a temporary status that exempts him from certain ethics and conflict-of-interest regulations. This 130-day period is set to expire in late May or early June.
International
Milei vows to make Argentina so strong that Falkland Islanders “choose” to join

Argentine President Javier Milei reaffirmed his country’s claim over the Falkland Islands (known as the Islas Malvinas in Argentina) and praised the role of the nation’s armed forces during a ceremony marking the “Veterans and Fallen Soldiers of the Malvinas War Day,” commemorating 43 years since the 1982 conflict with the United Kingdom.
Argentina continues to assert sovereignty over the islands, arguing that Britain unlawfully seized them in 1833.
“If sovereignty over the Malvinas is the issue, we have always made it clear that the most important vote is the one cast with one’s feet. We hope that one day, the Malvinas residents will choose to vote with their feet and join us,” Milei stated.
“That is why we aim to become a global power—so much so that they would prefer to be Argentine, making deterrence or persuasion unnecessary. This is why we have embarked on a path of liberation, working to make Argentina the freest country in the world and once again the nation with the highest GDP per capita on the planet,” he added.
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