A drop of water holds 1.5 sextillion atoms

We drastically underestimate how tiny atoms are. A single drop of water contains roughly 1.5 sextillion atoms. That is 1,500,000,000,000,000,000,000 atoms crammed into a space smaller than a tear. There are more atoms in a single glass of water than there are glasses of water in all the oceans of the world. Your hydration is mathematically incomprehensible.