CuriosityStream: Get 30 days free by following this link and using promo code stevemould: https://curiositystream.com/stevemould The Quartz Watch video is here: https://www.youtube.com/watch?v=_2By2ane2I4 Certain crystals, like quartz will produce a voltage when hit. It's all to do with the arrangement of atoms and charge in the lattice. It's used in lots of things like piezo lighters, sensors, speakers and oscillators for timekeeping. Animations by Dominic Burgess: https://www.youtube.com/channel/UCGI000V6ZIAQf97MNybAaLQ Thanks to these amazing patrons on Patreon for supporting my channel: Glenn Watson Peter Turner Joël van der Loo Patreon: https://www.patreon.com/stevemould Twitter: http://twitter.com/moulds Instagram: https://www.instagram.com/stevemouldscience/ Facebook: https://www.facebook.com/stevemouldscience/ Buy nerdy maths things: http://mathsgear.co.uk/