Crows can recognize geometric patterns, suggesting that humans aren't unique in understanding shape structure.

W hen most people think of shapes, they imagine a triangle, a rectangle, or maybe even a fancier- sounding rhombus or ...

Scientists tested crows on their ability to recognize “geometric regularity,” a skill previously assumed to be unique to ...

Crows in a lab were able to distinguish shapes that exhibited right angles, parallel lines, and symmetry, suggesting that, ...

Mathematicians have finally solved a geometry problem that has puzzled the field for decades. By wiggling a needle around while spinning it, you can minimize the amount of space it moves through, ...

RULER probably goes with T-SQUARE, though since T-SQUARE can only really refer to the tool used by designers and architects who need to create 90-degree angles. STENCIL probably goes with those two.