Cover image
The nematode worm Caenorhabditis elegans. Three life stages of C. elegans are shown: an adult hermaphrodite, a smaller larva, and ten newly laid eggs (with embryos developing inside them). These are all on a lawn of Escherichia coli bacteria (being eaten by the worms as food). The fully grown adult is roughly one millimeter long. (Cover photo credit: Marie-Anne Félix, Ecole Normale Supérieure, Paris, France. [For details, see Ichikawa et al., pp. 1902–1918.])
