A solar-powered airplane finished crossing the United States on Saturday, landing in New York City after flying over the Statue of Liberty during its historic bid to circle the globe, the project team said. The spindly, single-seat experimental aircraft, dubbed Solar Impulse 2, arrived at New York's John F. Kennedy International Airport at about 4 a.m. local time after it took off about five hours beforehand at Lehigh Valley International Airport in Pennsylvania, the team reported on the airplane's website. Such a pleasure to land in New York! For the 14th time we celebrate sustainability," said the project's co-founder Andre Borschberg on Twitter after flying over the city and the Statue of Liberty during the 14th leg of the trip around the globe. The Swiss team flying the aircraft in a campaign to build support for clean energy technologies hopes eventually to complete its circumnavigation in Abu Dhabi, where the journey began in March 2015. The solar cr...
The sabre-toothed cat lived alongside early humans, and may have been a fearsome enemy, say scientists. Several feline teeth - and a chunk of arm bone - were uncovered at a site in Germany known for the oldest discovery of human spears. The 300,000-year-old animal fossils are described as "spectacular". Several types of sabre-toothed cat - once known as the sabre-toothed tiger - lived for over 40 million years, before becoming extinct about 12,000 years ago.The predator had enormous teeth, which it used to rip through flesh. Dr Jordi Serangeli, of the University of Tubingen, Germany, said the remains proved for the first time that the sabre-toothed cat was living in Europe alongside early humans. "We can say that the humans - and the sabre-toothed cat - were living 300,000 years ago in the same area, in the same landscape," he told.
"The humans were hunters but they were not alone; they had to defend themselves from all the big carnivores."Homo Heidelbergensis was among the first type of early human to use wooden spears. Scatterings of animal bones found in their camps suggest they used the spears to hunt animals like the horse and deer. The latest find of five teeth and a bone from two individual sabre-toothed cats at a former coal mine in Schoningen near Hanover gives a new insight into the perils faced by early humans.
"The discovery illustrates the possible day-to-day challenges that the Schöningen hominins would have faced and suggests that the wooden spears were not necessarily only used for hunting, but possibly also as a weapon for self-defence," Dr Serangeli, and colleagues at the University of Leiden, report in the Journal of Human Evolution.
The cat's humerus bone - worked by humans into a rudimentary hammer- is the first example of its kind anywhere in the world, he added. Dr Mark Roberts of UCL, London, is an archaeologist at the Boxgrove site in southern England, which was home to one of Britain's oldest known human occupants, Homo heidelbergensis, 500,000 years ago.Evidence shows "hominins (humans and their ancestors) were already the top predator at this time; they were able to kill and butcher, without interruption and competition, large animals such as rhino, bison, horse and giant deer", he said.
But it is uncertain if humans around at the time used weapons to kill the sabre-toothed cat, he added. "If it could have been demonstrated that hominins killed the cat then that would have been very interesting but without more skeletal material that is impossible to demonstrate." The Schoningen excavation is a cooperation between the University of Tübingen and the State Service for Cultural Heritage of Lower Saxony.
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