Label the rectangles correctly with the letters A to I. Show puzzle solution Only the four blue-shaded rectangles below intersect three other rectangles, and therefore they must be F, G, H and I. H ...

In October 2024 Luke Durant, an independent researcher in San Jose, Calif., announced that he had discovered the largest known prime number—so enormous it would take years to write out in full. One ...

Time travel is deterministic and locally free, a paper says—resolving an age-old paradox. This follows research observing that the present is not changed by a time-traveling qubit. It’s still not very ...

t started as a fantasy, then a promise — inspired by biology and animated by the ideas of physicists — and grew to become a powerful research tool. Now artificial intelligence has evolved into ...