Nature's Laws
1. "Seventy percent of the earth's surface is water, and 90 percent of that is ocean. Only 3 percent of the total water is fresh water, and three-quarters of that is frozen at the polar ice caps. In essence, we directly depend on less than 1 percent of all water. Fortunately, water can exist in three major forms. An accident? Heat evaporates it from the oceans to form clouds, it moves over land, cools, and condenses back to water, snow, or ice. It then returns to earth, re-nourishes both plant and animal life, and returns to the sea. How might it be there if water could not make the changes to complete this cycle?"
2. "A geometric constant in nature is symmetry. . . . Any deviation from the usual design prompts the question, what's wrong with him, her, or it? Symmetry is much more than mere aesthetic appreciation, however. It has definite mechanical advantages. Imagine how a bear would survive if its teeth were misaligned, how a horse would gallop if its legs were randomly placed, or a bird would fly if its wings were different sizes. Did these symmetries evolve? If so, there's a lot of weird fossils still missing."
3. "Natural laws govern our existence. Like a bridge designed by an engineer, most structures in the living world fit into or can be explained by mathematical equations. Did the perfectly suited protective cushion in an elephant's foot come before it's hefty torso? Or did they come together? The evidence does not show a long line of crippled elephants breeding until the right cushion happened by mutation. And so it goes with nearly every aspect of every animal and plant."
