The formation of thymine dimers Slideshow Play

The formula for the area of a triangle Animation Play

The formula for the space diagonal of a cube Student activity Play

The formula for the space diagonal of a cube Whiteboard exercise Play

The frequency of free oscillation Whiteboard exercise Play

The frequency of free oscillation Student activity Play

The frequency of oscillation of strings Slideshow Play

The greyhound and the hare Animation Play

The handrail along stairs Whiteboard exercise Play

The height of the equilateral triangle Whiteboard exercise Play

The homolytic fission of C–C and C–H bond Animation Play

The inconsistencies in Kekulé's theory of the structure of benzene Student activity Play

The ionic character of s-block-metal compounds Student activity Play

The isosceles triangle Whiteboard exercise Play

The length of a curve Student activity Play

The length of a curve Animation Play

The length of a curve – a satellite circles the Earth Whiteboard exercise Play

The length of a curve – the minute hand of the clock Whiteboard exercise Play

The length of a curve – the small wheel rolling along a rod Whiteboard exercise Play

The length of a foot Animation Play

The length of a laser Illustration Play

The length of a metal rod Animation Play

The length of a vector on the plane Animation Play

The length of a velocity vector equals speed Animation Play

The length of an arc Whiteboard exercise Play