The day will officially be a bit longer than usual on Tuesday, June 30, 2015, because an extra second, or "leap" second, will be added. "Earth's rotation is gradually slowing down a bit, so leap seconds are a way to account for that," said Daniel MacMillan of NASA's Goddard Space Flight Center in Greenbelt, Maryland. Strictly speaking, a day lasts 86,400 seconds. That is the case, according to the time standard that people use in their daily lives - Coordinated Universal Time, or UTC. UTC is "atomic time" - the duration of one second is based on extremely predictable electromagnetic transitions in atoms of cesium. These transitions are so reliable that the cesium clock is accurate to one second in 1,400,000 years.

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El pasado 25 de abril Nepal fue golpeado por un terremoto de magnitud 7,8. Pero al igual que a los temblores, el país también es vulnerable al cambio climático, una combinación que hace más difícil construir la resiliencia y la preparación ante riesgos.

 Conforme las temperaturas medias se elevan en el sur de Asia, la temporada del monzón ha cambiado, dando lugar a precipitaciones más erráticas y aumentando el riesgo de inundaciones y deslizamientos de tierra que pueden cobrar vidas y la producción de alimentos.

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Rainwater could save people in India a bucket of money, according to a new study by scientists looking at NASA satellite data. The study, partially funded by NASA’s Precipitation Measurement Missions, found that collecting rainwater for vegetable irrigation could reduce water bills, increase caloric intake and even provide a second source of income for people in India.

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Trees that can tolerate soil pollution are also better at defending themselves against pests and pathogens. "It looks like the very act of tolerating chemical pollution may give trees an advantage from biological invasion", says Dr Frederic E. Pitre of the University of Montreal and one of the researchers behind the discovery. 

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California is still counting up the damage from the 2014 drought, which resulted in more than $200 million in losses in the dairy and livestock industry and a staggering $810 million in crop production. And analysts are predicting this year to be even worse.

But many will admit that if there is any country on earth that knows how to trump a three-year (and counting) drought cycle and convert a wasteland to oasis, it’s Israel. For thousands of years, populations have been wresting a livelihood from the desert of what is now Israel, refining the techniques that would one day result in an agricultural paradise.

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It’s been difficult to explain patterns of toxic mercury in some parts of the world, such as why there’s so much of the toxin deposited into ecosystems from the air in the southeastern United States, even upwind of usual sources.

A new analysis led by researchers at the University of Colorado Boulder shows that one key to understanding mercury’s strange behavior may be the unexpected reactivity of naturally occurring halogen compounds from the ocean.

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