Youre in a desert walking along in the sand when all of the sudden you look down, and you see a tortoise, its crawling toward you. You reach down, you flip the tortoise over on it's back. The tortoise lays on it's back, it's belly baking in the hot sun, beating it's legs trying to turn it'self over, but it cant, not without your help. But youre not helping. Why is that?