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“Happy hour” is not when you might expect it to be, according to a new analysis of about half a billion Twitter messages from around the globe. On average, people are chipper when they wake up and become grouchy as the day wears on.

By Meredith Wadman of Nature magazine US researchers are concerned that revised guidelines that recommend a minimum size for breeding lab rodents' cages will substantially increase the cost of animal work. The eighth edition of the Guide for the Care and Use of Laboratory Animals, published last year by the US National Academies in Washington DC, is the first to recommend minimum cage sizes for female rats and mice and their litters. [More]