Second Law of Thermodynamics:
"The total entropy of any isolated thermodynamic system always increases over time, approaching a maximum value."
Although the wording differs from one source to another, from mechanical constructs to cosmology, the idea is the same. Thermodynamics are universal, and they command everything, including you.

A simpler expression would be 'Order > Chaos.' Orderly things decay into disorder. Stars burn and explode. Buildings are constructed over months, used for years, and then brought to the ground in one day.

Consider this. Find a collection of objects near you which are in disorder, IE a pile of clothes. Now bring them to order, in this case by folding them. You have created a very small amount of order in our universe, but in doing so you have produced hundreds of times more disorder, mostly in the form of heat. You can't avoid it. Think about how much math your computer does; how much order it helps create. Now consider how much heat it is pumping out. Think about how much food you eat in your lifetime, and how much heat energy your body produces in the fight to grow against a decaying system.

I think this is the only scientifically relevant description of 'good and evil.' Its a logical and objective way of looking at anything, and figuring weather it is good or bad. Good has always been described as self-sacrificial, selfless and the more difficult of the two options. Evil has always been tied with fire, hot places, and destruction. It is more difficult to build then destroy. True. So what could be more beneficial to mankind then creating order? What could be more detrimental then destroying? And people think the world will fall into chaos without religion.

"But I can twist this." You say, "I could kill someone, another person who is generating heat and disorder with his or her every action." True, but if you make this argument from the platform of religion, I need only to point at a history book to prove that belief in a higher being is the number one killer of humans outside the realm of natural death. Any system can be twisted to fight its self. The important point is to know when to stop taking something literally.