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
Iranian leader warns foreign powers have “no place” in Strait of Hormuz
Iran’s Supreme Leader, Mojtaba Khamenei, said Thursday that the Persian Gulf is entering a new era marked by a “bright” future without the presence of the United States in the region.
His remarks came during the commemoration of Persian Gulf Day, amid ongoing regional tensions following recent military confrontations involving Iran, the United States, and Israel.
“Today, two months after the largest military buildup and aggression by the bullies of the world in the region and the humiliating defeat of the United States, a new chapter is being written for the Persian Gulf and the Strait of Hormuz,” Khamenei stated.
The Iranian leader insisted that the future of the region would be free from American influence and focused instead on the internal development and prosperity of Gulf nations.
“By the power and strength of God, the bright future of the Persian Gulf region will be a future without the United States and dedicated to the progress, welfare, and prosperity of its nations,” he said.
Khamenei also questioned the effectiveness of U.S. military bases in the region, arguing that they do not provide security even for Washington’s allies.
“Foreigners who come from thousands of miles away and commit evil and malicious acts have no place there except at the bottom of its waters,” he declared.
In addition, the Iranian leader defended new measures being prepared by Tehran to regulate maritime traffic through the Strait of Hormuz, including fees for vessels passing through the strategic waterway. According to Khamenei, the policies would generate economic benefits and greater stability for the region.
Regional tensions remain high following the conflict that erupted on February 28 between the United States and Israel against Iran, leading to strategic blockades in the Strait of Hormuz, a route through which nearly 20% of the world’s oil supply previously passed. The situation has disrupted maritime trade and contributed to rising global oil prices.
Central America
U.S. and Regional Allies Back Panama Amid Dispute With China
The United States, Bolivia, Costa Rica, Guyana, Paraguay and Trinidad and Tobago issued a joint statement in support of Panama’s sovereignty, arguing that China’s recent actions represent an attempt to politicize maritime trade and undermine the sovereignty of nations in the hemisphere.
“We are closely monitoring China’s selective economic pressure and recent actions affecting vessels flying the Panamanian flag,” the statement released Tuesday said. “Panama is a pillar of our maritime trading system and, as such, must remain free from undue external pressure.”
The statement comes amid growing tensions surrounding the Panama Canal and the operation of key ports linked to global trade.
At the end of January, Panama’s Supreme Court invalidated the legal framework supporting the 1997 concession that granted Panama Ports Company, a subsidiary of CK Hutchison, the right to operate the Balboa and Cristóbal terminals located on the Pacific and Atlantic entrances of the Panama Canal.
The ruling followed mounting pressure from the United States to curb Chinese influence around the strategic waterway, through which roughly 5% of global maritime trade passes.
CK Hutchison, which managed the ports for nearly three decades, rejected the court’s decision and accused Panamanian authorities of illegally confiscating its assets. The company has launched international arbitration proceedings against Panama, seeking more than $2 billion in damages.
Following the court ruling, reports emerged of increased detentions and inspections of Panamanian-flagged vessels in China, actions widely viewed as retaliatory measures.
On Wednesday, China’s Foreign Ministry dismissed the joint statement as “completely unfounded and misleading,” accusing the United States of politicizing port operations and warning that Beijing would take steps to protect its interests in Panama.
International
King Charles III Says U.S.-UK Alliance Is “Irreplaceable and Unbreakable”
King Charles III of the United Kingdom reaffirmed the strength of the British-American relationship on Tuesday during a speech before the United States Congress, describing the alliance between the two nations as “irreplaceable and unbreakable.”
The address, delivered at the Capitol, marked the first speech by a British monarch before Congress since Queen Elizabeth II in 1991 and comes at a time of political tensions between Donald Trump’s administration and the Labour government of Prime Minister Keir Starmer.
“As President Trump himself observed during his state visit to Britain last autumn, the bond of kinship and identity between the United States and the United Kingdom is invaluable and eternal. It is irreplaceable and unbreakable,” the king said.
While reflecting on the upcoming 250th anniversary of U.S. independence, which will be commemorated this year, Charles III stated that the partnership between the two countries “was born out of disagreement, but is no less strong because of it.”
The monarch emphasized the democratic values shared by both nations and noted that major global changes have occurred whenever the two allies found common ground.
“When we have found that way to agree, great changes have taken place not only for the benefit of our peoples, but for all peoples,” he said.
King Charles also quoted British Prime Minister Keir Starmer, who recently described the relationship as “an indispensable alliance.”
Concluding his speech, the monarch described the shared history of the United States and the United Kingdom as “a story of reconciliation, renewal, and an extraordinary partnership.”
He added that Washington and London have forged “one of the most consequential alliances in human history.”
“I pray with all my heart that our alliance continues to defend our shared values, together with our partners in Europe, the Commonwealth, and around the world, and that we ignore calls urging us to become increasingly isolationist,” Charles III stated.
The king ended by urging both nations to “recommit to one another in selfless service to our peoples and to all peoples of the world.”
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