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
At Least Eight Dead and 19 Injured in Deadly Bus Crash in Veracruz, Mexico
A tragic bus accident in the eastern state of Veracruz left at least eight people dead and 19 others injured on Wednesday afternoon, according to local authorities.
The vehicle was traveling through the town of Zontecomatlán when it crashed near a ravine, state Civil Protection officials reported late Wednesday night. “Regrettably, the prosecutor’s office has confirmed eight fatalities,” the agency stated in an official release.
Emergency Response and Medical Care Rescue teams worked into the night to assist the survivors. The 19 injured passengers were stabilized at the scene before being transported to hospitals in the nearby municipalities of Chicontepec and Huayacocotla. While the identities of the victims have not yet been released, Mexican press reports indicate the bus was en route from Mexico City to Chicontepec.
A Recurring Issue on Mexican Highways Road accidents involving long-haul passenger buses and freight transport are a frequent occurrence in Mexico. Experts often cite excessive speed, mechanical failure, or driver fatigue as the primary catalysts for these tragedies.
This latest incident follows another major disaster in late November, where 10 people were killed and 20 injured in a similar bus crash in the western state of Michoacán. The recurring nature of these accidents continues to spark national debate regarding the enforcement of stricter safety regulations for commercial transport units.
International
Jair Bolsonaro Hospitalized for Inguinal Hernia Surgery While Serving Sentence for Attempted Coup
Former Brazilian President Jair Bolsonaro, currently serving a 27-year prison sentence for an attempted coup, underwent surgery this Thursday for an inguinal hernia. The procedure took place at the DF Star Hospital in Brasilia, according to his wife, Michelle Bolsonaro.
The 70-year-old former leader left prison on Wednesday for the first time since his incarceration in late November to prepare for the operation. “My love has just gone to the surgical center,” Michelle Bolsonaro posted on Instagram, where she has been documenting her accompaniment during his hospitalization.
Surgical Expectations and Health History Medical professionals treating the far-right ex-president (2019-2022) anticipate the operation will last approximately four hours. His recovery period in the hospital is expected to extend between five and seven days.
Dr. Claudio Birolini explained on Wednesday that while the surgery is standardized, it remains complex due to the patient’s history. Bolsonaro continues to suffer from the long-term effects of a 2018 campaign rally stabbing, an injury that required several major abdominal surgeries in the years following the attack.
“There is no such thing as a simple surgery. However, this is a scheduled and standardized procedure, so we expect it to be carried out without major complications,” Dr. Birolini stated.
Potential Additional Procedures Following the hernia repair, the medical team will evaluate whether Bolsonaro can undergo a second procedure: an anesthetic block of the phrenic nerve. This nerve controls the diaphragm, and the intervention would aim to resolve a chronic case of recurrent hiccups that has plagued the former president for years.
Bolsonaro remains under heavy security at the medical facility as he serves his lengthy sentence related to the events surrounding the January 2023 institutional crisis in Brazil.
International
Trump Orders Construction of New ‘Golden Fleet’ to Revitalize U.S. Naval Superiority
President Donald Trump issued an executive order this Monday for the immediate construction of two new warships that will bear his name. These vessels will be the pioneers of what he described as the “Golden Fleet,” a future generation of “Trump-class” battleships that he claimed would be “100 times more powerful” than those currently in service.
The announcement took place at his private residence in Mar-a-Lago, Florida. The President indicated that following the initial two ships, the administration aims to commission up to 25 additional vessels. He is scheduled to meet with Florida-based contractors next week to expedite production, criticizing existing defense firms for failing to deliver results efficiently.
This naval expansion is a cornerstone of Trump’s goal to revitalized the American shipbuilding industry and address the strategic gap between the U.S. and competitors like China.
The move comes amid heightened geopolitical tension. Just last week, Trump ordered the seizure of all sanctioned tankers involved with Venezuela’s “ghost fleet” to cripple the country’s crude oil industry. Since December 10, the U.S. military—deployed in the Caribbean under the guise of counter-narcotics operations—has already detained two tankers linked to Venezuelan oil transport.
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