LifeThe third factor: Beyond nature and nurture We're more than the product of our genes and environment, twin studies show. If we could run our lives over and over, we'd turn out differently every time Features
EarthFrack on or frack off: Can shale gas save the planet? Optimists see the new resource as a cheap, clean "bridging fuel" to a low-carbon future. The true picture might not be so simple, says Michael BrooksFeatures