EarthStripy ponds in the Utah desert help green the bone-dry landMulticoloured patchwork ponds in this desert play a key part in tapping sources of potassium chloride, a vital fertiliserRegulars
SpaceChris Hadfield: We should live on the moon before a trip to Mars The next stage of our push into space should be setting up home on the moon, says astronaut Chris Hadfield, who warns a rush to Mars would be deadly Features