Animation created by Wes Bellanca and Memorie Yasuda. Earthguide

The updatePictureState method of DrawingApp periodically saves a
frame to disc and the frequency with which it does this can be altered by changing the interval number
(each save does cause the animation to pause for a fraction of a second as it isn't run on a separate

Simple diagram showing structure of DNA, from chromosomes in nucleus to double helix

Meiosis, the form of cell division unique to egg and sperm production, sets the stage for sex determination by creating sperm that carry either an X or a Y sex chromosome. But what is it about the X or Y that determines sex? Before a meiotic cell divides, its two sets of chromosomes come together and cross over, or swap, segments. The first animation shows normal crossing over, where the X and Y chromosomes exchange pieces only at their tips. The second animation shows a rare mistake in which the Y chromosome transfers a gene called SRY to the X chromosome, resulting in sex-reversed babies. Studies of sex-reversed individuals led researchers to identify the master switch for sex determination, the SRY gene, which tells a fetus to become a boy.

Water Cycle - Earthguide Animated Diagram

The diagram below gives four examples of computer-generated random walks (generated using a C# Winform application).

Two of the science's most illustrious expounders were Buffon and Oliver Goldsmith, from both of whom we learn (L'Histoire generale des animaux and A History of Animated Nature) that the domestic cow sheds its horn every two years.