Thermodynamics can be seen as a game where you’re trying to get work done and God, your opponent, is trying to cause the heat death of the universe. Here are the rules:

0. You must play
1. You can’t win
2. You can’t break even
3. You can’t quit

The second rule is usually called “entropy”: eventually every system will run out of the capacity to do work (“free energy” / “negentropy”). The capacity to do work comes from difference in energy: stuff gets done while energy moves around. Entropy is usually interpreted to mean that all systems tend toward lower complexity / less order / homogeneity.

Creationists say that entropy is an argument against naturally-occurring life. But life on earth is mooching off the sun. The sun is dying; the solar system’s total entropy is increasing; life is just a random blip:

Some scientists even figure that life increases entropy faster than a static earth would (“Sooner or later everything turns to shit” – Woody Allen). Eventually the negentropy required to sustain life will be gone and everything will be dead – but we’ve got at least a billion years.