15. They Had Zero In Their Number System
Even though we take the number zero for granted now, it must’ve been quite a fascinating journey to create a symbol that symbolized ’emptiness’. And the Mayans did just that.
Even though the use of zero is first seen in Mesopotamia around 3 BC, the Mayans independently developed the concept of zero during 4 A.D. They denoted it by using a symbol that looked like a seashell.