Originally Posted by
Brainache
I don't think this is true. Cells die all the time and are replaced by new ones.
You might be thinking of the fact that every atom in our bodies was formed billions of years ago inside stars (one of my favourite facts).
Nope, cells die all the time and are replaced. They are replaced by another cell dividing in two. No cell is ever created from scratch, apart from the very first one. Ever since then they have been dividing until one became a sperm and one an egg and merged and started dividing etc. and became you.
Edit: Oops, so I read the rest of the thread, ninja'd so many times.