http://www.bostonglobe.com/business/ 2014/08/31/technology-tracks-players-speed-football-field/z0Kc736R3GJVBf7fQjg9JL/story.html • 13: ”Glazier tools" by Hans Bernhard (Schnobby) - Own work. Licensed under CC BY-SA 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Glazier_tools.JPG#mediaviewer/File:Glazier_tools.JPG • 14: "Professor Lucifer Butts" by Rube Goldberg - an old comic book. Licensed under Public Domain via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Professor_Lucifer_Butts.gif#mediaviewer/ File:Professor_Lucifer_Butts.gif • 19: Vagrant logo http://commons.wikimedia.org/wiki/File:Vagrant.png#mediaviewer/File:Vagrant.png Ansible logo http://www.ansible.com/hs-fs/hub/330046/file-764918156-png/Official_Logos/ansible_circleA_black.png • 22: "Victorinox Multitool" by EvaK - private. Licensed under FAL via Wikimedia Commons - http:// commons.wikimedia.org/wiki/File:Victorinox_Multitool.jpg#mediaviewer/File:Victorinox_Multitool.jpg