conservation of mass and energy?????? ok... i get the principle, but what about birth? Meaning what about when someone is born, where is that mass coming from? Where is the energy coming from? The only thing i can think of is the nurishment the mom takes and gives to the baby, but how can that possibly equate to a human? More fundatmental a question i guess would be how does physics deal with growth in humans? i know this question may be off the wall, but, well, im fairly odd, and ive been curious about this for a while..... any comments?