"Horizon" was born on 2 May 1964. This celebration presents 99 excerpts from the series' first 21 years - a fast-moving collection of some of the best moments so far. Some are funny, some moving, some classic and some bizarre.

Crocodiles, microprocessors, super-tankers, test-tube babies, electric wheelbarrows, earthquakes, magnetic microbes, the moons of Jupiter, DNA, ECT, flying machines, victims of asbestos and of smoking, Peruvian peasants, Chinese nursery schools, tree museums, dancing plants, paradise pills, sticklebacks, tower blocks, lasers and jelly.... all these and many more have been the subject of "Horizon"'s probing of 21 years of science.

(Feature: page 9)