Darwin: Who Wants to Live a Million Years?
Learn about natural selection through this Science Channel interactive game, Who Wants to Live a Million Years?
Chapter four of Charles Darwin's, The Origin of Species.
Natural Selection in a Bottle
Studies selection on the norm of reaction of age at first reproduction in a laboratory population of Drosophila melanogaster.
Wikipedia: Natural Selection
Hyperlinked article about the primary mechanism within the scientific theory of evolution.