MathematicsThese centuries-old equations predict flowing fluid – until they don’t We use the Navier-Stokes equations every day, for applications from building rockets to designing drugs. But sometimes they break – and we don’t know why Comment
CommentThe 25 best fictional robots – according to Âé¶¹´«Ã½ From R2D2 to the Terminator via Bender and Johnny-5, we choose our favourite robots from books, films and television series Culture