Every Breath Is a Biographical Archive of Humanity
A single inhale carries about 25 sextillion air molecules; because Earth's atmosphere mixes thoroughly on timescales of a few years, there’s a very high likelihood that every breath contains at least one molecule exhaled by Julius Caesar, Cleopatra, and many others who lived long ago. This makes the air a living, centuries-spanning archive of humanity, though the reasoning doesn’t apply to dinosaurs due to longer timescales.