Where would we be with this dot?! It doesn't seem like much, but it's a critical element to our quick understanding of numbers. Without a decimal point or radix point, we have to mentally solve a little puzzle to figure out what the numbers we see actually mean. But with it, we know exactly what numbers we're looking at, and we know it instantly. And thanks to the printing press, we got rid of the line that just... wasn't very good at communicating what we needed to know. Decimals!