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
Sheinbaum highlights anti-drug gains after U.S. says challenges remain
Mexican President Claudia Sheinbaum on Friday highlighted her government’s achievements in the fight against drug trafficking, after the United States said challenges remain in combating organized crime.
On Thursday, Mexican Foreign Minister Juan Ramón de la Fuente held talks with his U.S. counterpart, Secretary of State Marco Rubio. Following the meeting, the U.S. State Department said in a statement that “despite progress, challenges still exist” in addressing organized crime.
“There are very strong results from joint cooperation and from the work Mexico is doing: first, a 50% reduction in fentanyl seizures at the U.S. border,” Sheinbaum said during her regular morning press conference.
The president also said that authorities have seized nearly 320 tons of drugs and that there has been a “40% decrease in intentional homicides in Mexico” since the start of her administration on October 1, 2024.
Sheinbaum added that the United States should implement campaigns to reduce drug consumption within its territory and curb the flow of weapons into Mexico.
“There are many results and there will be more, but there must be mutual respect and shared responsibility, as well as respect for our sovereignties,” she said.
On Monday, Sheinbaum held a phone call with U.S. President Donald Trump to discuss security issues. She said she once again ruled out the presence of U.S. troops in Mexico to fight drug cartels.
Security has been a recurring issue used by Trump to threaten tariffs on Mexico and to pressure negotiations over the USMCA (T-MEC) free trade agreement, which are scheduled for 2026.
The agreement is crucial for Mexico’s economy, as about 80% of the country’s exports are destined for the United States.
International
Canada accuses Iran of killing its citizen during anti-government unrest
A Canadian citizen has died “at the hands of Iranian authorities,” the Canadian government said on Thursday, amid ongoing protests against the government in Tehran.
“I have just learned that a Canadian citizen has died in Iran at the hands of Iranian authorities,” Canada’s Minister of Foreign Affairs, Anita Anand, said, without providing further details. She added that Tehran’s response to what she described as “peaceful protests” has “led the regime to show a blatant disregard for human life.”
On Thursday, the United States imposed sanctions on Iranian security officials and individuals linked to the country’s banking networks, accusing them of orchestrating a violent crackdown on peaceful demonstrations and laundering billions of dollars in oil revenues. U.S. Treasury Secretary Scott Bessent announced the measures following what were described as the largest anti-government protests in the history of the Islamic Republic, although demonstrations have reportedly eased in recent days amid heavy repression and a near week-long internet shutdown.
“The United States stands firmly with the Iranian people in their pursuit of freedom and justice,” Bessent said in a statement, adding that the sanctions were imposed at the direction of President Donald Trump.
Those sanctioned include Ali Larijani, secretary of Iran’s Supreme National Security Council, whom Washington accused of coordinating the repression and the use of force against protesters.
International
Ukraine declares nationwide energy emergency amid russian attacks and extreme cold
The Ukrainian government on Wednesday declared a nationwide energy state of emergency amid continued Russian military attacks and extreme winter weather, with nighttime temperatures dropping as low as minus 18 degrees Celsius.
“The consequences of Russian attacks and worsening weather conditions are severe (…) Overall, a state of emergency will be declared for Ukraine’s energy sector,” Ukrainian President Volodymyr Zelensky said in a statement posted on social media following a meeting with senior officials.
Zelensky announced the creation of a “permanent coordination headquarters” to manage the crisis in the capital, Kyiv, and tasked former defence minister and current energy chief Denys Shmyhal with overseeing support efforts for affected individuals and communities, including addressing power outages, heating shortages and other “practical issues.”
“There are many problems that require urgent solutions,” the president said, noting that repair crews, energy companies, municipal services and the State Emergency Service are working “around the clock” to restore electricity supplies. Kyiv has been particularly affected after Russian strikes last Friday disabled key parts of the power grid, as daytime temperatures hover around minus 12 degrees Celsius and plunge to minus 18 at night.
Zelensky added that public authorities will “maximize efforts with partners to obtain the necessary equipment and additional support,” while the government will ensure “maximum deregulation of all processes” to speed up the connection of backup power equipment to the grid. He also confirmed that work is underway to significantly increase electricity imports into Ukraine.
The Ukrainian leader further instructed his Cabinet to review curfew regulations in light of the extreme cold, arguing that citizens must have the greatest possible access to assistance centers, while businesses should be given flexibility to plan their operations according to the state of the energy system.
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