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Today on New Scientist: 24 August 2009

发布时间:2019-03-08 09:01:10来源:未知点击:

We’ll be running this daily round-up as an experiment for the next two weeks. Did you find it useful? Do you have suggestions about how we can make it better? Let us know. Thanks for your comments so far: we’re taking notes. Mystery of the missing mini-galaxies The Milky Way should be surrounded by thousands of tiny galaxies, but we’ve only seen about two dozen. That spells trouble for gravity as we know it Regular marijuana usage robs men of sexual highs Survey finds that frequent cannabis smokers have more sexual encounters, but are also more likely to find it difficult to reach orgasm or experience premature ejaculation Stem cell spinal injury trial put on hold Plans to give human embryonic stem cells their first clinical test have hit yet another roadblock Landing sites on Europa identified 3D images made using photos from the Galileo spacecraft have revealed smooth strips on Jupiter’s moon Europa – possible sites for a future landing Disrupt emergency exits to boost evacuation rates The rate that a crowd can exit a packed room through a narrow exit rises if an obstacle is placed in front of the door, physicists have found Climate change could swamp Venice’s flood defence A new study suggests that sea level rises by the end of the century will mean Venice is inundated up to 250 times a year – and flood barriers may not be enough to save it Your genome isn’t that precious – give it away As the popularity of genetic tests grows, so do concerns about privacy. We should stop being so self-important, says Katrina Voss Robot with bones moves like you do Replicating human bones,