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

US panel backs Trump-themed coin amid controversy

The United States Department of the Treasury confirmed to AFP that the Commission of Fine Arts approved the design of a new collectible coin featuring Donald Trump, with members of the commission appointed by the current administration.

According to the proposal, the coin will feature an image of Trump standing with clenched fists over a desk on the obverse, while the reverse will display an eagle, a traditional symbol of the United States.

The sale price of the collectible has not yet been disclosed, although the United States Mint typically offers similar items for more than $1,000.

“There is no more iconic portrait for the front of these coins than that of our president Donald Trump,” U.S. Treasurer Brandon Beach said in a statement sent to AFP. He added that two additional coins — a $1 piece and a one-ounce gold coin — are also under consideration.

However, the Citizens Coinage Advisory Committee (CCAC), another body responsible for reviewing new coin proposals, declined to discuss the Trump design in late February.

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“Only nations governed by kings or dictators place the image of a sitting leader on their currency,” said Donald Scarinciat the time. “No country in the world has minted coins featuring a democratically elected leader during their term in office,” he added.

When contacted by AFP, the Treasury Department did not immediately respond to requests for further comment.

International

Fed’s Waller warns of rising inflation risks amid Middle East conflict

Christopher Waller, a governor at the Federal Reserve, said Friday that he is increasingly concerned about the inflationary impact of the ongoing conflict involving United States and Israel against Iran, particularly due to the prolonged closure of the Strait of Hormuz.

Waller, who had supported interest rate cuts over the past year amid concerns about the labor market, said he has shifted his stance in recent weeks due to rising inflation risks.

“Since the Strait of Hormuz was closed, it suggests this conflict could be much more prolonged and that oil prices will remain elevated for longer,” Waller said in an interview with CNBC.

“Therefore, this indicates that inflation is a greater concern than I had previously assessed,” he added.

Waller also backed the Federal Reserve’s decision earlier this week to keep interest rates unchanged, signaling a more cautious approach as global geopolitical tensions continue to affect economic outlooks.

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International

Brazil offers to mediate Colombia-Ecuador tensions, calls for restraint

The government of Brazil has offered to mediate in the ongoing tensions between Colombia and Ecuador, while calling on both nations to exercise restraint.

In a statement released Wednesday, Brazil’s Ministry of Foreign Affairs urged the parties involved to act with moderation and seek a peaceful resolution to the dispute.

“Brazil encourages all sides to act with moderation in order to find a peaceful solution to the controversy. It stands ready to support dialogue efforts aimed at preserving peace and security in the region,” the statement said.

Brazil also expressed “serious concern” over reports of deaths in the border area between Colombia and Ecuador, noting that the circumstances surrounding the incidents have not yet been clarified.

The diplomatic move comes amid rising tensions between the neighboring countries, increasing regional concern over stability and security along their shared border.