Radiation

http://xkcd.com/radiation/

What triggers mass extinctions? Study shows how invasive species stop new life

http://www.sciencedaily.com/releases/2010/12/101230100050.htm

What's inside a Dalek?

http://www.ecs.soton.ac.uk/about/news/3691

Chasing Immortality

http://www.enlightennext.org/magazine/j30/kurzweil.asp