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...
US scientists examined the resting examples of customary social orders in Africa and South America, whose ways of life nearly take after antiquated seeker gatherers. They observed 98 individuals for 1,165 evenings, and found that they dozed for a normal of 6.5 hours for each night. By examination, the researchers said that the vast majority in the US get around seven hours, as per a huge rest survey. The new study, distributed in the diary Current Biology, additionally observes that temperature assumed a more prominent part than light in molding resting examples. Prof Jerome Siegel, from the University of California, Los Angeles, said: "The issue is: what is the information on how rest has changed? "What's more, it struck me that these gatherings, which are quickly vanishing, give the last chance to truly recognize what human rest was similar to before we all made our different civilization. From fake lights, to late night TV, and now the ever-present sparkle of our advanced mobile phones, cutting edge life is regularly rebuked for destroying our rest.
To put this under a magnifying glass, the analysts concentrated on
the Hadza of Tanzania, the San of Namibia and the Tsimane of Bolivia, fitting their volunteers with wristwatches that screen rest. "Each of the three gatherings have basically the same rest span and practically the same timing of rest," said Prof Siegel. "This gives me sensible certainty that they mirror the normal human science and they are not a component of their specific circumstances, which are diverse." And finding that the normal rest term was six hours and 25 minutes, the specialists additionally discovered the members once in a while took snoozes. "What is totally clear is that they don't rest more than we do."Commenting on the research, Prof Derk-Jan Dijk, from the Surrey Sleep Research Centre at the University of Surrey, said that it was an important study but he did not agree that the data showed that our ancestors slept less than us.
"There are people in our society who don't get enough sleep, there is no doubt about it," he told. "The question of whether we sleep that much less than so many years ago has been unanswered in ways - we need to be careful in interpreting that data." He said that while the hunter gatherers did not fall asleep until several hours after sunset, artificial light was keeping us awake for even longer. He explained: "We have artificial light in abundance and we have our clock-determined social commitments and the timing doesn't have anything to do with sunrise or sunset. We are to a large extent disconnected from those natural cycles.
"I think we need to re-evaluate the timing of our social schedules, including work, relative to the natural environment. Our social environment has an impact on when we decide to go to sleep and wake up. "Also if we look at our environmental variables in the light-dark cycle in our homes and the temperature, I hope his paper will make us see how relevant are they for the timing of our behaviour."
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