Many dead animals in the past changed to fossils while others preferred to be oil. Genetics explain why you look like your father and if you don't why you should. Vacuums are nothings. We only mention them to let them know we know they' re there. Some oxygen molecules help fires burn while others help make water, so sometimes it's brother against brother.
Some people can tell what time it is by looking at the sun.
But I have never been able to make out the numbers. We say the cause of perfume disappearing is evaporation. Evaporation gets blamed for a lot of things people forget to put the top on. To most people solutions mean finding the answers. But to chemists solutions are things that are still all mixed up.