We all know that with the law of physics there are certain irrefutable truths. What is the boiling point, for instance? We know that water boils at 212 degrees Fahrenheit at one atmosphere of pressure (sea level), and not a degree before. And we also know that water freezes at 32 degrees Fahrenheit. The study of science is made easier by these laws which can be counted on to take effect each time certain points are reached.
Unfortunately, the same cannot be said for human nature.