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
Uribe requests freedom amid appeal of historic bribery conviction
Former Colombian President Álvaro Uribe on Monday requested that the Supreme Court restore his freedom while he appeals the historic 12-year house arrest sentence he received for bribery and procedural fraud.
Uribe, the most prominent figure of Colombia’s right wing, was convicted last week by a lower court for attempting to bribe paramilitary members into denying his ties to the violent anti-guerrilla squads.
Since Friday, the 73-year-old has been under house arrest at his residence in Rionegro, about 30 km from Medellín. The judge justified the measure by citing a risk of flight.
However, Uribe’s defense team rejected that argument and formally petitioned the court to immediately lift the detention order, claiming it lacks legal basis.
Uribe, a dominant force in Colombian politics for decades, is now the first former president in the country’s history to be convicted and placed under arrest, found guilty of witness tampering and obstruction of justice to prevent links to paramilitary groups.
He has repeatedly denounced the trial as politically motivated, blaming pressure from the leftist government currently in power.
His political party, Centro Democrático, has called for nationwide protests on August 7 in support of Uribe, who remains popular for his hardline stance against guerrilla groups.
Uribe has until August 13 to submit his written appeal. The case will then move to the Bogotá High Court, which has until October 16 to uphold, overturn, or dismiss the sentence. If the deadline passes without a decision, the case will be archived.
International
U.S. Embassy staff restricted as gunfire erupts near compound in Port-au-Prince
The poorest country in Latin America and the Caribbean is currently engulfed in a deep political crisis and a wave of violence driven by armed groups — a situation that an international security mission led by Kenya is attempting to stabilize.
Due to the worsening security conditions, the U.S. government has suspended all official movements of embassy personnel outside the compound in Port-au-Prince, the U.S. State Department announced Monday in a security alert posted on social media platform X.
“There are intense gunfights in the Tabarre neighborhood, near the U.S. Embassy,” the alert reads, urging the public to avoid the area.
Tabarre is a municipality located near Port-au-Prince International Airport, northeast of the Haitian capital.
According to a July report by the UN High Commissioner for Human Rights, at least 3,141 people were killed in Haitibetween January 1 and June 30 of this year.
International
Israel says 136 food aid boxes airdropped into Gaza by six nations
The Israeli military announced on Sunday that 136 boxes of food aid were airdropped into Gaza by the United Arab Emirates, Jordan, Egypt, Germany, and Belgium.
“In recent hours, six countries conducted air drops of 136 aid packages containing food for residents in the southern and northern Gaza Strip,” read the statement, which added that the operation was coordinated by COGAT, the Israeli defense body overseeing civil affairs in the occupied Palestinian territories.
The Israeli military emphasized that they will “continue working to improve the humanitarian response alongside the international community” and reiterated their stance to “refute false allegations of deliberate famine in Gaza.”
The announcement comes as UN agencies warn Gaza faces an imminent risk of famine. More than one in three residents go days without eating, and other nutrition indicators have dropped to their worst levels since the conflict began.
The agencies also noted the difficulty of “collecting reliable data in current conditions, as Gaza’s health systems —already devastated by nearly three years of conflict— are collapsing.”
Meanwhile, Gaza’s Hamas-run Health Ministry reported on Sunday that hospitals in the enclave recorded six deaths from hunger and malnutrition on Saturday, all of them adults.
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