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A gas cloud has been spotted approaching the Milky Way's central black hole. Observations of its closest approach, expected to occur in mid-2013, may offer insight into the black hole's immediate surroundings. See Letter p.51
Cocaine use causes lasting changes in behaviour by altering the strength of connections between neurons. The finding that these changes can be reversed in mice suggests strategies that could be used to treat drug addiction. See Letter p.71
Tightrope walkers use poles to keep their balance. A study reveals that agama lizards use their tails much like balancing poles as they leap through the air — and that some dinosaurs may have done the same. See Letter p.181
