Rose petals' unique shapes come from stress during growth. Differential growth and mechanical stresses create curled edges. Research shows petals violate a mathematical condition, causing stress.

The drive to get every student to take so-called college gateway courses has succeeded, a new federal study finds, but students taking Algebra 1 and Geometry classes are getting considerably less ...

THESE works are by mathematical masters at Rugby School. Their united aim (in connection with Mr. Wilson's two previous parts) is to provide a complete course of geometrical teaching, and so to meet a ...