Images

All banner images via Wikimedia Commons, specifically:

1. Dominik from Germany (Party like it’s 1969) [CC-BY-SA-2.0 (http://creativecommons.org/licenses/by-sa/2.0) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0)]
2. Christian Mertes [CC-BY-3.0 (http://creativecommons.org/licenses/by/3.0)]
3. Marek.magrys (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0-2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/3.0)]
4. John Snow (Rewardiv at en.wikipedia) [Public domain]
5. By Jonathan Rashad (2 million protestors in Tahrir Square) [CC-BY-2.0 (http://creativecommons.org/licenses/by/2.0)]