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Photo credits:
Picture 1: (Rama’s Arrow at the English language Wikipedia [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/)], from Wikimedia Commons)
Picture 2: This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
Picture 3: This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
Picture 4: This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
Picture 5: This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
Picture 6: This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author’s life plus 70 years or less.