https://oldsite.awaldorfjourney.com/2012/03/physics-week-one-sound/?utm_source=rss&utm_medium=rss&utm_campaign=physics-week-one-sound experiences, resources and advice from a Waldorf teacher on the journey Thu, 16 Jan 2014 23:18:35 +0000 hourly 1 https://wordpress.org/?v=6.7.1