1http://en.wikipedia.org/wiki/The_Seven_Pillars_of_Life↩

2http://dictionary.cambridge.org/ dictionary/english-german?q=Life↩

3http://www.merriam-webster.com/dictionary/life↩

4http://dictionary.reference.com/browse/Life↩

5http://dictionary.cambridge.org/ dictionary/english-german?q=Life↩

6http://www.evolutionnews.org/2013/07/gerald_joyce_de074891.html↩