Your weirdo friend is =ISBLANK(cell). It spits out TRUE or FALSE. Boring? No! It’s a lie detector for empty cells.
But here’s the real fun. You flip it with NOT. =NOT(ISBLANK(A1)) becomes the “Is Not Blank” test. It’s like saying, “Hey, is there actually anything here?”
Why does this matter? Because an empty cell is a ghost. It breaks sums. It ruins averages. It makes your boss cry.
