"It is bad in most countries but in Rwanda, my home country, it is catastrophic," says the 29-year-old veterinary surgeon. In Rwanda, the grey-crowned crane, which has a striking crown of stiff golden feathers and a bright red spot on its neck and stands at more than a metre high, has become prized as an adornment for private houses and hotels acro...

Tech Monthly: Meet the great young minds changing our world for the better: The Observer's science editor Robin McKie hails this year's winners of the Rolex Awards for Enterprise - pioneers in the fields of technology, science, health, environment and exploration, all aged under 30, who are spearheading innovative projects that are helping to impro...