@BoltonSch Tweet 23/07/2014 03:11 PM Tweet 23/07/2014 03:11 PM Posted by Bolton School on 23 Jul 2014 Modified by Bolton School on 08 Sep 2023 @BoltonSch High-Altitude Balloon Project provides 'Optics Picture of the Day' on optics website: bit.ly/1lv6Dmh