Creative commons attribution license images courtesy: Wikimedia Commons, Alan Light, Terry Chay, britta heise, Chemical and Engineering News, jcookfisher, JD Harvill, Kelly Parker McPherson, Ben Fredricson, tongueandcheek, Sofia Salom, Horia Varlan, Jean Pichot, Grand Canyon NPS, Jessica Merz, shira gal, Peet de Rouw, yensid1998, Steven Betts, Irina Chipenko, Pete R., torbakhopper, jaime gartelos, cliff1066, andy carter, Conan, Larry Ziffle, Monique Miller, Peter Lindberg, Terrazzo, Richard Taylor, Alasdair Middleton, cristinadharma, David Noah, 561design, Frank Kovalchek, David Sim, Georg Sommeregger, alanagkelly, sammydavisdog, bcmom, Dawn Loh, Danielle Martin, Paul W Locke, Meekrok, Cam-Fu, Special Collections Research Center GW, David Chilstrom, Patrick Pearse, N.C. Mallory, Hungry Dudes, The National Guard, Paul Goyette, sweetbeetandgreenbean, Mr. Ducke, Meaghan O'Malley, gkdavie, Stuart Grout, joyosity, crowolf, gapplewagen, Heather, deflam, Tobyotter, Alison Elizabeth x, doegox, Clint Gardner, Thadd Selden, Chiot's Run, VISHAL TOMAR, teacher_caroline_acsp, adaenn, louise_marston, Mark Sutherland, Sharon Hunter, kerryj.com, epSos.de.Old-timey music from Archive.org