We are fond of saying things are symmetric, but what does that really mean? Intuitively we have a sense of symmetry as a kind of mirroring. Suppose we draw a vertical line through the middle of a ...

A GCSE Maths video explaining rotational symmetry. This video looks at finding the order of rotational symmetry of different 2D shapes using worked examples. Find out more about GCSE Maths.

There's a part of the brain that enables us to perceive magnitude -- we can compare loudness when hearing different tones or compare the number of dots in a group at a glance. Neuroscientists have ...