Contentment comes from paying others to take on chores such as cleaning and cooking, a study says.
Scientists worry that the melting of the Greenland ice sheet could accelerate and raise sea levels more than expected.
China might not have the lead in research but its application of secure networks is leading the way.
Supersonic car is set for low-speed runs
10 years of Galaxy Zoo, a citizen science phenomenon
Will nuclear fusion always be 30 years away?
Is there really such a thing as a 'flying ant day'?
Are scientists getting closer to teleporting humans?
Giant test chamber swallows Hubble telescope successor
Programmes, video and downloads: Solutions to air pollution from across the world
Meet the student giving care home residents bike rides