Type I diabetes occurs when the immune system destroys crucial cells in the pancreas. But what prompts the body to turn against itself so disastrously? It seems that insulin is the key.

The somites are embryonic elements that give rise to the muscles, skeleton and some skin layers of the trunk. They form in a symmetrical fashion, but to do so they must be shielded from asymmetrical cues.

The visual equipment of box jellyfish includes eight optically advanced eyes that operate with only a rudimentary nervous system. As they produce blurred images, their function remains an open question.