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In the biological world, there are natural laws governing [[plant growth]], [[animal behavior]], [[infectious disease]]s and so on.
Human beings, however, tend to be unpredictable. This could be because they were granted [[free will]] by God (compare [[Determinism]]), or because predicting the behavior of complex systems is computationally hard .<ref>Scott Aaronson, <i>''Quantum Computing since Democritus</i> '' lecture notes. http://www.scottaaronson.com/democritus/lec18.html Retrieved 1/1/2012</ref>.
==Physical science==
