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 作者:东方染壶     |      日期:2019-03-05 06:16:02
An experimental vaccine could mean we never see another major Ebola outbreak. In a trial launched in 2015, when the Ebola virus was still spreading in West Africa, 5837 people in Sierra Leone and Guinea received the vaccine. After the first 10 days, there were no Ebola cases in those vaccinated, while 23 people in the control group developed the disease (The Lancet, doi.org/bwm9). China’s space agency has revealed plans to soft-land a probe on the far side of the moon in 2018, and to launch its first Mars probe by 2020. It also wants to send a craft to Jupiter by 2030. The missions will reveal new details of the solar system’s origins and turn China into a “space power”, the agency said. Cheetahs could soon be added to the endangered list: there may only be 7100 of them left, confined to only 9 per cent of their former range (PNAS, doi.org/bwnc). In Zimbabwe, their numbers have fallen from 1200 to only 170 animals in just 16 years. North Korean leader Kim Jong-un has said that the country is close to developing an intercontinental ballistic missile. The claim, made in his New Year address, comes after two North Korean nuclear tests in 2016. US president-elect Donald Trump responded in a tweet that a North Korean weapon capable of reaching the US “won’t happen”. Children in England have already had half their recommended maximum daily sugar intake before they get to school. According to dietary data analysed by Public Health England, children consume an average of 11 grams of sugar around breakfast, largely from drinks,