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The lab, though it may seem quiet and insulated, can be as full of background noise as a crowded train station when we're trying to catch the announcements. Our brains can filter out the noise and focus on the message up to a certain point, but turning up the volume on the loudspeakers – improving the signal-to-noise ratio – helps as well.

By Daniel Cressey of Nature magazine Ranching cod off the coast of Iceland is far more financially sensible than conventional fishing methods or keeping the fish in cages, according to a new analysis. Fish ranching -- where the animals are free to roam but trained to return to a certain point so they can be caught -- could one day become a significant part of global fisheries, fitting between traditional catching and aquaculture, says Bj