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
Six killed, including baby, in armed attack near tourist beach in Ecuador
Six people, including a baby girl about two years old, were killed on Sunday in an armed attack near a tourist beach in southwestern Ecuador, police said. The shooting, carried out with rifles, also left three people wounded.
The incident took place in the coastal town of Puerto López, in the province of Manabí, a popular tourist destination known for whale watching. The attack occurred amid a surge of violence over the weekend that left at least nine people dead nationwide, according to local media reports.
“There are six fatalities and three injured,” Colonel William Acurio, the local police commander, told reporters on Sunday. He confirmed that one of the victims was a baby “approximately two years old.”
Authorities have not released further details about the motive behind the attack or whether arrests have been made.
International
Man accused of killing nine in Paramaribo dies by suicide in police custody
The man who killed nine people, including five children, on Saturday night in Paramaribo died by suicide while in custody, Suriname police confirmed in a statement on Monday.
The suspect, identified by the initials D.A., 43, “hanged himself inside a holding cell at the Keizerstraat police station” in the capital, Paramaribo, according to the official report.
Police said the man sustained leg injuries during his arrest and was taken to a hospital before being transferred to the detention facility on Sunday night. Authorities did not provide further details on the circumstances surrounding his death.
International
Winter storm disrupts holiday travel, forcing 1,500 flight cancellations in the U.S.
Airlines canceled around 1,500 flights across the United States during the peak Christmas travel season after warnings of a severe winter storm and forecasts of heavy snowfall in the Midwest and Northeast. An additional 5,900 flights were delayed due to adverse weather conditions.
More than 40 million Americans were under snowstorm warnings or weather advisories one day after Christmas. Meanwhile, another 30 million people faced flood or storm alerts in California, where an atmospheric river triggered intense rainfall.
New York City was bracing for up to 25 centimeters (10 inches) of snow overnight, which would mark its heaviest snowfall in four years. Cold weather was expected to persist through the weekend in the nation’s largest city. According to flight-tracking website FlightAware, airports in the New York area recorded about 850 flight cancellations.
Six killed, including baby, in armed attack near tourist beach in Ecuador
Man accused of killing nine in Paramaribo dies by suicide in police custody
Winter storm disrupts holiday travel, forcing 1,500 flight cancellations in the U.S.
Tec de Monterrey honors one of its students for his contribution to nanotechnology in medicine
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