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...
Monarchs are the only insects to migrate such a vast distance. So, by teaming up with biologists, mathematicians set out to recreate the internal compass they use to navigate on that journey. The findings are published in the journal Cell Reports. Lead researcher Prof Eli Shlizerman, from the University of Washington, explained that, as a mathematician, he wants to know how neurobiological systems are wired and what rules we can learn from them. "Monarch butterflies [complete their journey] in such an optimal, predetermined way," he told. "They end up in a particular location in Central Mexico after two months of flight, saving energy and only using a few cues." Prof Shlizerman worked with biologist colleagues, including Steven Reppert at the University of Massachusetts, to record directly from neurons in the butterflies' antennae and eyes. "We identified that the input cues depend entirely on the Sun," explained Prof Shlizerman. "...