Costa Rica is the greenest and happiest country in the world, according to a new list that ranks nations by combining measures of their ecological footprint with the happiness of their citizens. Britain is only halfway up the Happy Planet Index (HPI),...

Currently astronauts have to resort to drinking instant coffee heated by microwaves.In zero gravity, water floats in globules and adheres to any receptacle in which it is placed, posing the problem of moving the water through a coffee filter.Also, in...