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
President Sheinbaum Hails Fátima Bosch’s Miss Universe Win as a Victory for Women’s Voices
Mexican President Claudia Sheinbaum praised Fátima Bosch on Friday for winning the Miss Universe 2025 title, recognizing her as a symbol of courage for Mexican women and highlighting her stance against an act of injustice during the international pageant.
Bosch, a native of Tabasco, claimed the crown at the competition held in Thailand. Her participation drew significant attention following an incident involving the director of Miss Universe Thailand, Nawat Itsaragrisil, who told her to remain silent for not sharing event-related content on her social media platforms. The remark prompted Bosch to walk out of the room in protest, an action supported by several other contestants.
President Sheinbaum denounced expressions like “you look prettier when you’re quiet,” asserting: “Women look more beautiful when we speak up and participate. And she raised her voice, saying, ‘This is unjust, I don’t agree.’”
Fátima Bosch, 25, became the fourth Mexican woman to win the Miss Universe crown, joining Lupita Jones (1991), Ximena Navarrete (2010), and Andrea Meza (2020).
Bosch triumphed over Thailand’s Veena Praveenar, who placed as first runner-up, and Venezuela’s Stephany Abasaly, who took third place. This year’s pageant featured contestants from 120 countries and territories, including nine mothers, one transgender woman, a genocide survivor, and the first-ever Palestinian contestant in the competition’s history.
International
Peru Orders Arrest of Betssy Chávez Amid Diplomatic Rift With Mexico
Peru’s Judiciary issued an international arrest warrant and ordered five months of pretrial detention on Friday for former Prime Minister Betssy Chávez, who is facing charges of attempting a coup d’état and is currently taking refuge in the Mexican Embassy in Lima.
Peru severed diplomatic relations with Mexico, arguing that the asylum granted to Chávez constitutes interference in its internal affairs. The former prime minister is accused of participating in former President Pedro Castillo’s attempted coup in December 2022.
“The court orders five months of pretrial detention for the defendant Betssy Chávez Chino, as well as national and international search and arrest notices,” the Judiciary stated.
Judge Juan Carlos Checkley argued that there is a “clear” flight risk and a significant chance of jeopardizing the upcoming oral trial.
The Supreme Anti-Corruption Prosecutor’s Office said it secured pretrial detention for Chávez “on charges of rebellion and, alternatively, conspiracy, to the detriment of the State.”
Chávez, who has been on trial since March 2025, faces a potential 25-year prison sentence. She has been staying for 18 days at the Mexican Embassy residence in Lima, awaiting a safe-conduct pass to leave the country.
The Peruvian government announced on November 7 that it intends to seek a review of regional diplomatic asylum regulations, following Mexico’s decision to grant protection to Chávez.
Relations between the two countries deteriorated after Castillo’s ousting, when Mexico granted asylum to the former president’s wife and two children. Since then, both governments have withdrawn their ambassadors.
International
Paraguay launches dengue vaccination for children in high-risk areas
Dengue fever, transmitted by the Aedes aegypti mosquito, remains a persistent threat in tropical and subtropical countries such as Paraguay, where it claimed the lives of 132 people among nearly 100,000 infections during the 2023–2024 Southern Hemisphere summer, according to official data. However, that figure was lower than the record set in the 2012–2013 season, when 252 deaths were reported among roughly 130,000 infections.
“Today marks a very important step toward protecting our children and bringing peace of mind to families,” Paraguay’s Minister of Health, María Teresa Barán Wasilchuk, said in a speech on Wednesday.
The vaccine will be administered to children between 6 and 8 years old in municipalities with the highest incidence of dengue cases in the past five years. Authorities will use TAK-003 (Qdenga), developed by Takeda—one of Japan’s largest pharmaceutical companies—which was approved by the World Health Organization (WHO) in 2024.
“We celebrate this step, which positions Paraguay as a country with one of the most robust immunization programs,” said Héctor Castro, director of the Acosta Ñu Pediatric Hospital. “We will work tirelessly to ensure this government decision becomes a success in the fight against this scourge.”
Vaccinating children against dengue “is not only a historic and public health milestone, but also a humanitarian one,” Castro added during remarks delivered at the hospital in San Lorenzo, near the capital, Asunción.
President Sheinbaum Hails Fátima Bosch’s Miss Universe Win as a Victory for Women’s Voices
Peru Orders Arrest of Betssy Chávez Amid Diplomatic Rift With Mexico
Paraguay launches dengue vaccination for children in high-risk areas
Tec de Monterrey honors one of its students for his contribution to nanotechnology in medicine
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