HumansNew Scientist’s guide to the 21 best ideas of the 21st century A quarter of a century in, this is our definitive pick of the ideas in science and technology that are already transforming the world Features
91É«Ç鯬In the race to reach 100, the wealthy have a head start There are more centenarians now than ever before. But more must be done to address inequalities that prevent people from having a realistic chance of hitting this milestone. Leader