January 08, 2016 at 07:56AM

Color coding N3 in summary #teach180 https://t.co/UU6G3Tru2l http://twitter.com/rutherfordcasey/status/685460091282165760

January 05, 2016 at 09:19AM

Another strong use for a textbook: students are clever and adjusted the height to exactly 1 meter. #teach180 https://t.co/u5depcbfPg http://twitter.com/rutherfordcasey/status/684393908860772352