[1] Giancoli, Douglas C. Physics: Principles With Applications. 6th ed. Upper Saddle River, NJ: Pearson, 2005. Print.

[2] "Feather and Ball Bearing Dropped in Vacuum." Starship Asterisk. Uploaded by teralabUK, 2008. Web video. Retrieved 10 April 2012 from: http://www.youtube.com/watch?v=_XJcZ-KoL9o

[3] "How Autumn Leaves Get a Lift." Cho, Adrian, 22 Oct. 2004. Web. Retrieved 10 April 2012 from: http://news.sciencemag.org/sciencenow/2004/10/22-01.html

[4] "Newton's Second Law of Motion." The Physics Classroom, 2012. Web. Retrieved 10 April 1012 from: http://www.physicsclassroom.com/class/newtlaws/u2l3e.cfm

[5] "Light Pillars." Heidorn, Keith C, 27 Jan. 1999. Web. Retrieved 9 April 2012 from: http://www.islandnet.com/~see/weather/eyes/pillars.htm

[6] "Catching the Flutter of a Falling Leaf - Mathematical Model Indicates that Motion of Sheet of Paper Falling Through Air is Chaotic." Peterson, Ivars, 17 Sept. 1994. Web. Retrieved 9 April 2012 from: http://findarticles.com/p/articles/mi_m1200/is_n12_v146/ai_15861210/

http://greatkids.outdoors.org/2010/10/hiking-through-yankees-top-25-towns-for.html

Additional thanks to Dr. David Newman