The larger of the two triangular geometric features (scale bar = 10 cm.) Charles Helm The Pleistocene epoch, which started 2.6 million years ago and lasted until about 11,700 years ago, was crucially ...

Scientists have identified grid cells, neurons that fire in repeating triangular patterns as the eyes explore visual scenes, in the brains of rhesus monkeys. This is the first time grid cells have ...

For centuries, mathematicians and floor designers alike have been fascinated by the shapes that can tile a plane — in particular, those that do so without repetition. Now, a team of chemists has ...