Gained a few kilos? Don't be too hard on yourself - an invisible force field and a boson called Higgs could be the real culprits.

Newton thought he had gravity nailed when the apocryphal apple fell on his head in 1665. But 250 years later a young upstart called Einstein declared that gravity wasn't a property of the Earth or any other matter — gravity is what you get when matter distorts space-time. Read more...