1. Different smells CAN be made of the same atoms. In our case, we saw C, H, and O repeatedly!
2. Different smells, while made of the same atoms, can have different amounts of those atoms, like 8 of C or 10 of C.
3. Some smells may have all the same letters and numbers but be TOTALLY different smells. We figured out that they must be arranged different. And we drew some models to think about this.