What makes a tree a tree? Or rather, why can we recognize trees in even quite abstract depictions when they are so varied in nature? Researchers have found a clue in the branches, and used math to ...

A seemingly impossible math puzzle, discovered stuck to a tree by a passing hiker, has left the internet well and truly stumped. Despite living in an increasingly digital world, math remains something ...

Piet Mondrian painted the same tree in "The gray tree" (left) and "Blooming apple tree" (right). Viewers can readily discern the tree in "The gray tree" with a branch diameter scaling exponent of 2.8.