23. All pictures used in this presentation are Creative Commons-licensed Attribution-NonCommercial-ShareAlike 3.0 Unported Trenches http://www.flickr.com/photos/8344872@N05/5562719438 Time http://www.flickr.com/photos/hichako/137338252 Fear Eye http://www.flickr.com/photos/36939586@N08/4193432039 Red Helix http://www.flickr.com/photos/maldiviandude/3505149064 Bridge http://www.flickr.com/photos/vgm8383/2182671142 Don’t Walk http://www.flickr.com/photos/24113869@N07/3383336742 Walk Sign http://www.flickr.com/photos/44678756@N00/34987182 Hurdles http://www.flickr.com/photos/52505743@N05/5395866237 Trench Coats http://www.flickr.com/photos/jaded/6584854 Apples & Oranges http://www.flickr.com/photos/95272747@N00/131206032 Spotlight http://www.flickr.com/photos/34123770@N05/3202396970 Cash http://www.flickr.com/photos/johnnyvulkan/381941233 Hands Reaching http://www.flickr.com/photos/52338454@N07/5121653046 Tightrope http://www.flickr.com/photos/druclimb/325661568 EduConhttp://www.flickr.com/photos/specialkrb/5408635711 To learn more, visit http://creativecommons.org