Village authorities insisted on handling the khipus without gloves to feel the fibre differences. (Credit: William Hyland) Two vibrant bundles of string, over 10,000 feet high in the Peruvian Andes, ...

Scientists seeking the secrets of the universe would like to make a model that shows how all of nature’s forces and particles fit together. It would be nice to do it with Legos. But perhaps a better ...

Brian had an unconventional upbringing, which encouraged his curiosity. He grew up to become a theoretical physicist, fascinated with both big issues like the shape of time and space, and the ...