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.

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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.

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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.

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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.

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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”.

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

International

Artemis II crew prepares for Earth return and splashdown recovery

Astronauts from the Artemis II mission are expected to be extracted from the Orion spacecraft approximately two hours after splashdown, scheduled for 20:07 UTC this Friday (6:07 p.m. in San Salvador), according to NASA.

Following recovery, a rescue team will transport the crew by aircraft to the USS John P. Murtha. Once onboard, they will undergo medical evaluations before boarding another flight to the Johnson Space Center.

On Thursday, NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, along with Canadian astronaut Jeremy Hansen from the Canadian Space Agency, continued preparations for their return to Earth.

Their activities include stowing equipment used during the mission, securing cargo and storage compartments, and installing and adjusting crew seats to ensure all items are properly fastened. The crew will also review the latest weather updates, recovery operations status, and reentry timeline, while preparing for post-landing procedures.

At 21:53 UTC (9:53 p.m. in San Salvador), Orion’s thrusters are scheduled to perform a second trajectory correction maneuver, refining the spacecraft’s path back to Earth. During this operation, Hansen will monitor guidance, navigation, and propulsion systems.

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NASA explained that during Friday’s reentry, the service module will separate about 20 minutes before Orion reaches the upper atmosphere southeast of Hawaii. If necessary, a final trajectory adjustment will fine-tune the flight path before the capsule begins a series of roll maneuvers to safely distance itself from jettisoned components.

Just before atmospheric interface, Orion will reach a peak speed of approximately 3,800 km/h. As it descends to about 400,000 feet (around 121.9 km), communications will be interrupted for approximately six minutes due to plasma formation around the capsule during peak heating.

NASA expects the crew to experience up to 3.9 G during a nominal reentry profile. After exiting the blackout phase, the capsule will jettison its forward bay cover. Drogue parachutes will deploy at around 22,000 feet (6.7 km), followed by the three main parachutes at approximately 6,000 feet (1.8 km).

Artemis II marks NASA’s first crewed flight test of the Space Launch System (SLS) rocket and Orion spacecraft around the Moon. The mission aims to validate capabilities for deep space human exploration and lay the groundwork for future long-term scientific missions on the lunar surface.

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International

Flooding in Dominican Republic leaves child dead and thousands affected

A two-year-old girl died after a wall of her home collapsed amid severe flooding that struck Dominican Republic on Wednesday. The heavy rains also caused power outages, school closures, and reduced working hours across affected areas.

Authorities issued preventive alerts in 15 of the country’s 31 provinces due to intense rainfall accompanied by thunderstorms that began Tuesday night.

Juan Méndez, director of the Center of Emergency Operations (COE), confirmed the child’s death to the press. The incident occurred in Santo Domingo Oeste, part of the capital region.

According to Red Cross officials, the girl died when a wall in her home collapsed following a landslide triggered by hours of heavy rain.

President Luis Abinader provided an update from the COE, stating that government agencies had been mobilized since early morning, particularly in Greater Santo Domingo, to protect lives and minimize material damage.

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Floodwaters left several vehicles submerged, while others were swept away by strong currents. Authorities estimate that around 250,000 families have been affected by the flooding.

Earlier, Public Administration Minister Sigmund Freund announced reduced working hours, encouraging remote work for those facing transportation difficulties, while maintaining in-person operations for essential services.

International

Bill Gates to testify before Congress over Epstein connections

Bill Gates is set to testify on June 10 before a congressional committee in United States investigating links connected to the late sex offender Jeffrey Epstein, a source familiar with the matter told AFP on Tuesday.

The Microsoft co-founder is among several high-profile figures named in documents released by the Department of Justice, which detail alleged close associations, questionable financial dealings, and private photographs involving Epstein.

According to a spokesperson cited by Politico, Gates “welcomes” the opportunity to appear before the committee. The representative emphasized that Gates “never attended or participated in any illegal activities with Epstein” and is prepared to answer questions to support the investigation.

The Bill & Melinda Gates Foundation did not immediately respond to AFP’s request for comment.

In late February, Gates told members of his foundation’s board that his association with Epstein was a “huge mistake.” He has consistently denied any involvement in the financier’s criminal activities. Epstein died by suicide in prison in 2019 while awaiting trial on charges of sex trafficking minors.

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“I did nothing illegal. I saw nothing illegal,” Gates said, according to a recording obtained by The Wall Street Journal.

Gates acknowledged that his relationship with Epstein began in 2011, three years after Epstein pleaded guilty to soliciting prostitution from a minor.

A draft email written by Epstein and released by the Department of Justice referenced alleged extramarital relationships involving Gates. The message, which was apparently never sent, claimed that Epstein had helped “Bill” obtain medication related to encounters with Russian women.

Gates admitted to having had two extramarital affairs but denied any involvement with Epstein’s victims.