John https://speakerdeck.com/jbabb 2019-03-01 16:37:21 -0500 Intro Sun, 03 Mar 2019 00:00:00 -0500 https://speakerdeck.com/jbabb/intro https://speakerdeck.com/jbabb/intro pads_history.pdf Fri, 01 Mar 2019 00:00:00 -0500 https://speakerdeck.com/jbabb/pads-history https://speakerdeck.com/jbabb/pads-history Helmets Fri, 01 Mar 2019 00:00:00 -0500 https://speakerdeck.com/jbabb/helmets https://speakerdeck.com/jbabb/helmets