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
Iran issues threat to Trump as conflict escalates over Strait of Hormuz
The head of Iran’s Supreme National Security Council, Ali Larijani, threatened U.S. President Donald Trump on Tuesday, warning him to “beware of being eliminated.”
The Republican president had warned on Monday that he would strike Iran “very hard” if the Islamic Republic blocked oil shipments through the Strait of Hormuz, which has effectively been closed since the war began eleven days ago.
“Iran is not afraid of your empty threats. Others more powerful than you tried to destroy the Iranian nation and failed. Beware that you are not eliminated,” Larijani wrote on X.
Earlier, Iran’s Revolutionary Guards — the ideological military force of the Islamic Republic — also said their forces would move to block oil exports from the Gulf.
Meanwhile, Israeli Prime Minister Benjamin Netanyahu said Israel’s military offensive against Iran is far from over.
“Our aspiration is that the Iranian people free themselves from the yoke of tyranny; ultimately, that depends on them. But there is no doubt that with the measures taken so far we are breaking their bones, and we are not finished yet,” Netanyahu said in a statement.
International
Driver detained after suspicious vehicle incident near the White House
The driver was detained and no injuries were reported after an incident that occurred before dawn in Lafayette Square, just north of the White House.
The U.S. Secret Service, which is responsible for presidential security, said in a statement that it was “investigating a suspicious vehicle.” The driver of the car was taken into custody and is currently being questioned.
Washington remains under heightened security measures amid the ongoing conflict involving the United States and Israel against Iran.
Police closed several major streets around the White House. However, by about 8:30 a.m. local time (12:30 GMT), government employees and staff from nearby institutions were allowed to pass through the area with proper identification, according to an AFP journalist at the scene.
Dozens of emergency vehicles with flashing lights responded to the location, while tourists and residents waited for authorities to reopen the streets.
International
Trump Raises Possibility of “Friendly Takeover” of Cuba Amid Deepening Crisis
The President of the United States, Donald Trump, reiterated Monday the possibility that Washington could pursue a “friendly takeover” of Cuba, amid the severe crisis facing the island following the oil blockade promoted by the U.S. government.
Speaking at a press conference in Miami, the president said that U.S. Secretary of State Marco Rubio is currently “negotiating” with representatives of the Cuban government, although authorities in Havana have repeatedly denied that such talks are taking place.
Trump suggested that Washington could play a more direct role in the island’s future.
“It may be a friendly takeover. It may not be a friendly takeover. It wouldn’t matter because they’re really down to, as they say, fumes. They have no energy, they have no money. They are in deep trouble on a humanitarian basis, and we really don’t want to see that,” the U.S. president said.
The president also argued that the Cuban government had long depended heavily on support from Venezuela, particularly oil supplies.
According to Trump, that support has been drastically reduced following measures adopted by Washington.
“They were living off Venezuela. Venezuela doesn’t send them energy, fuel, oil, money, or anything anymore. They couldn’t survive without Venezuela, they couldn’t have made it, and we cut everything off,” Trump said.
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