This type of thing allows people to test different behaviours in a virtual environment, find out what works and what doesn't, then apply those lessons to the real world. (canadianbusiness.com)
Combine that with over 65 unique weapons all with different behaviours and stats and you will never feel like your playing the same way twice! (thezombiechimp.com)
However after 1990 the temperature anomalies for different latitude bands show very different behaviour. (skepticalscience.com)