It is often asked, where do almonds come from? Do almonds come from peaches or apricots? Almonds in fact do not come from neither, although all 3 are form a very similar family.
It is easily accepted that that water pressure increases with depth, and yet if we were to ask someone why does water pressure increase with depth, not many would be able to answer that question. Fortunately, after...
Why does water expand instead of contract when frozen? It's all due to the density, which can be easily explained with these diagrams.