HeadSqueezer Huw James has a go at creating an exothermic reaction? Links: Endothermic and Exothermic reactions: http://chemistry.about.com/cs/generalchemistry/a/aa051903a.htm Elephant Toothpaste: http://chemistry.about.com/od/chemistrydemonstrations/a/elephanttooth.htm The Bloodhound Project: http://www.bloodhoundssc.com/project Elephants actually brush their teeth? http://www.today.com/pets/happy-brush-your-elephants-teeth-day-945779