PhysicsGravity's secret: How relativity meets quantum physics Some neat tricks with gravity could finally probe how it affects the quantum realm and allow us to devise a theory of everything, says Michael BrooksFeatures
EarthRacing refraction: Who reached the North Pole first? Peary or Cook? The bending of sunlight has helped to reveal who bent the truth in a century-old debate about which explorer was the first to the North Pole Features