2⁰ equals 1, in fact N⁰ is 1 for all N.

0 factorial equals 1, which some might find surprising.

You might already know that you cannot divide anything by 0.

The zero is a very important number, yet it took some time for it to be invented.

The Zero Saga contains the following quotation from Professor Hossein Arsham:

"The introduction of zero into the decimal system in the 13th century was the most significant achievement in the development of a number system, in which calculation with large numbers became feasible. Without the notion of zero, the descriptive and prescriptive modeling processes in commerce, astronomy, physics, chemistry, and industry would have been unthinkable. The lack of such a symbol is one of the serious drawbacks in the Roman numeral system. In addition, the Roman numeral system is difficult to use in any arithmetic operations, such as multiplication."

In later pages, we see another important use of the zero.