Sources

http://environmentalchemistry.com/yogi/periodic/O.html

http://en.wikipedia.org/wiki/Oxygen

http://www.juliantrubin.com/bigten/oxygenexperiments.html

http://en.wikipedia.org/wiki/Carl_Wilhelm_Scheele

http://en.wikipedia.org/wiki/Joseph_Priestley

http://en.wikipedia.org/wiki/Antoine_Lavoisier

http://www.youtube.com/watch?v=WuG5WTId-IY

http://www.infobarrel.com/Interesting_Facts_About_Oxygen_(O)