Today on New Scientist: 24 September 2009

 作者:楚踱     |      日期:2019-03-08 04:01:01
This is a digest of the stories posted to from 6pm yesterday until 6pm today. We’re running it as an experiment. Did you find it useful? Do you have suggestions about how we can make it better? Let us know. You can now subscribe to these digests by RSS Why ‘Star Wars’ missile defence lives on Technical headaches and political problems prompted the cancellation of US missile defence plans in Europe – but it survives in another guise Greenhouse effect all in chemical bonds Molecules containing multiple fluorine atoms bonded to carbon atoms are particularly effective at trapping heat Contraceptives to help poor cope with climate change A pioneering project in Ethiopia offers both family planning and new farming techniques – which could help poor communities cope with climate change What should make of the HIV vaccine ‘triumph’? At last, a clinical trial of an HIV vaccine has worked – sort of. New Scientist takes a look at what this means for the worldwide fight against AIDS Bugs to reveal songbird social lives By recording which birds are spending time together, and where, the tags can reveal how birds learn songs from their neighbours Years of caste system belie Indians’ shared ancestry Inbreeding within the Indian caste system could have led to a rise in genetic diseases The world’s best impact craters Approximately 150 impact craters are known on Earth. See the most spectacular examples in our gallery Widespread water may cling to moon’s surface A trio of spacecraft has found evidence that the moon may be covered with trace amounts of water, overturning previous ideas How far could you travel in a spaceship? An astronaut could reach the edge of the cosmos and return – as long as they know when to slam on the brakes Climate change may trigger earthquakes and volcanoes Even tiny changes in weather and climate can trigger geological disasters, so we should be wary of provoking the planet further Asteroid attack: putting Earth’s defences to the test A massive rock will strike the planet in 72 hours. Would we prepare or panic? The US air force tried to find out The population delusion There are 7 billion of us and counting, but the raw numbers hide a multitude of complexities For proteins,