References:
- http://www.biography.com/people/charles-darwin-9266433
- http://www.bbc.co.uk/timelines/zq8gcdm
- http://www.westminster-abbey.org/our-history/people/charles-darwin
- http://www.history.com/news/10-things-you-may-not-know-about-charles-darwin
- http://intentblog.com/10-strange-and-little-known-facts-about-charles-darwin/
- http://evolution.about.com/od/Darwin/ss/5-Interesting-Facts-About-Charles-Darwin.htm#step6