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.

20250501_mh_noexigencia_dui_728x90

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.

20250501_mh_noexigencia_dui_728x90

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.

20250501_mh_noexigencia_dui_728x90

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.

20250501_mh_noexigencia_dui_728x90

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”.

20250501_mh_noexigencia_dui_728x90

Chadian paleontologist Clarisse Nekoulnang said the team was “trying to find sites older than that of Toumai”.

International

Former South Korean President Yoon sentenced to five years in prison

Former South Korean president Yoon Suk-yeol was sentenced on Friday to five years in prison for obstruction of justice and other charges, concluding the first in a series of trials stemming from his failed attempt to impose martial law in December 2024.

The sentence is shorter than the 10-year prison term sought by prosecutors against the 65-year-old conservative former leader, whose move against Parliament triggered a major political crisis that ultimately led to his removal from office.

Yoon, a former prosecutor, is still facing seven additional trials. One of them, on charges of insurrection, could potentially result in the death penalty.

On Friday, the Seoul Central District Court ruled on one of the multiple secondary cases linked to the affair, which plunged the country into months of mass protests and political instability.

International

U.S. deportation flight returns venezuelans to Caracas after Maduro’s ouster

A new flight carrying 231 Venezuelans deported from the United States arrived on Friday at the airport serving Caracas, marking the first such arrival since the military operation that ousted and captured President Nicolás Maduro.

On January 3, U.S. forces bombed the Venezuelan capital during an incursion in which Maduro and his wife, Cilia Flores, were captured. Both are now facing narcotrafficking charges in New York.

This was the first U.S.-flagged aircraft transporting migrants to land in Venezuela since the military action ordered by President Donald Trump, who has stated that he is now in charge of the country.

The aircraft departed from Phoenix, Arizona, and landed at Maiquetía International Airport, which serves the Venezuelan capital, at around 10:30 a.m. local time (14:30 GMT), according to AFP reporters on the ground.

The deportees arrived in Venezuela under a repatriation program that remained in place even during the height of the crisis between the two countries, when Maduro was still in power. U.S. planes carrying undocumented Venezuelan migrants continued to arrive throughout last year, despite the military deployment ordered by Trump.

20250501_mh_noexigencia_dui_728x90

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.

20250501_mh_noexigencia_dui_728x90

“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.