Rainbows!

Do you remember the excitement in school science lessons when the teacher declared today the class would be doing a practical? Tim the gentleman scientist is bringing a medley of real live chemistry and physics demonstrations on stage, at least four of which will create rainbows in different ways. The price for this is twofold: 1. Money. 2. He will discuss the history and chemistry of various cool rocks he's bringing, like what makes rubies fluoresce and the idiot who got pyrite named fool's gold. There will be no fire or loud bangs. Autism friendly.