I came across this a while ago but I'm only just getting round to posting it. It's an animation showing how mitochondria generate ATP. Maybe quite relevant us, since mitochondrial dysfunction is thought to be a key part of ME/CFS: http://www.xvivo.net/powering-the-cell-mitochondria/ "The animation highlights the creation of Adenosine Triphosphate (ATP) mobile molecules which store chemical energy derived from the breakdown of carbon-based food. ATP molecules act as a kind of currency, imparting chemical energy to power all the functional components of cellular activity. This piece is the second in a series of award winning animations XVIVO is creating for Harvards educational website BioVisions at Harvard."