How does a single seed hold a whole tree?

Hold an acorn in your hand. It weighs almost nothing. You could tuck it in your pocket and forget it's there. And yet somewhere inside this tiny thing, a massive oak tree is waiting — roots that will crack through stone, a trunk you won't be able to wrap your arms around, branches that will shade half a yard. How does something so small hold something so enormous?
The secret is this: the seed doesn't actually contain a tree. It contains instructions. Think of it like a recipe card for chocolate chip cookies. The card itself isn't the cookies — it's just the steps written down. The seed is nature's recipe card, written in a chemical language called DNA.
