This might be stupid but I was thinking, when two subatomic particles collide at very high speeds, they form a bigger particle whose mass is less than the sum of the smaller ones, and the mass lost transforms into energy as in Einstein´s equation E=mc2. What happens with non subatomic particles, say two balls colliding or whatever. Is there a mass loss that turns into energy. THIS SOUNDS VERY OFF LOL, because the amount of energy released with just a little bit of mass is huge. But then, what is wrong here? Why doesn't this happen, or if it does, why isn't it percieved?