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

Death toll from southern Spain train crash rises to 40

The death toll from the train accident that occurred on Sunday in southern Spain has risen to 40, according to investigative sources cited by EFE on Monday afternoon.

Since early Monday, search operations have focused on the damaged carriages of a Renfe train bound for Huelva, which collided with the last derailed cars of an Iryo train traveling from Málaga to Madrid after it left the tracks.

The crash has also left more than 150 people injured. Of these, 41 remain hospitalized, including 12 in intensive care units at hospitals across the Andalusia region.

More than 220 Civil Guard officers are working at the site, searching the railway line and surrounding areas for key evidence to help identify victims and determine the causes of the accident.

The tragedy has revived memories of the deadliest railway disasters in Europe in recent decades. In Spain, the most severe occurred on July 24, 2013, when an Alvia train derailed near Santiago de Compostela, killing 80 people and injuring 130 others.

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At the European level, the worst rail disaster took place on June 3, 1998, in Eschede, northern Germany, when a high-speed train struck a bridge pillar at 200 kilometers per hour, resulting in 98 deaths and 120 injuries.

International

Spain’s Prime Minister pledges transparency after train crash kills at least 39

Spanish Prime Minister Pedro Sánchez pledged on Monday to ensure “absolute transparency” regarding the causes of a train crash that killed at least 39 people on Sunday in southern Spain, warning that the death toll could still rise.

The fatal accident occurred in the Andalusia region, where the number of confirmed deaths reached 39 by Monday morning, according to a spokesperson for the Ministry of the Interior.

Authorities were preparing to deploy heavy machinery to lift several derailed train cars. “We are waiting for cranes to be installed this morning to lift cars one, two and three of the Alvia train, which suffered the most damage,” said Andalusian regional president Juanma Moreno Bonilla on regional television. “It is likely that once they are lifted, we may find more victims,” he added.

The disaster also left more than 120 people injured. As of Monday afternoon, 43 victims remained hospitalized, including 12 in intensive care, according to emergency services.

International

Over 160 christian worshippers kidnapped in Kaduna Church attacks

More than 160 Christian worshippers were abducted on Sunday during coordinated attacks carried out by armed gangs on two churches in a remote village in Kaduna State, northern Nigeria, according to a cleric and a United Nations report accessed by AFP on Monday.

Nigeria, Africa’s most populous nation, has witnessed a renewed surge in mass kidnappings since November, prompting the United States government to carry out military strikes on Christmas Day in the northwestern state of Sokoto.

U.S. President Donald Trump accused Nigerian armed groups of targeting Christians, describing the violence as a form of “genocide” against the religious community.

According to Reverend Joseph Hayab, president of the Christian Association of Nigeria in the north, the attackers arrived in large numbers, blocked access to the churches, and forced worshippers to flee into nearby forests.

“The attackers came in large numbers, sealed off the entrances to the churches, and drove the faithful into the bush,” Hayab told AFP.