Did you know that the number zero was actually invented by the ancient Babylonians around 300 BC? Before that, there was no concept of zero in mathematics. Another interesting fact is that the word hundred comes from the Old Norse word hundrath, which literally means 120. This is believed to have originated from the way early Germanic tribes counted in groups of 12. The famous Fibonacci sequence, where each number is the sum of the two preceding ones, can actually be found in nature! From the arrangement of leaves on a stem to the spiral patterns of pinecones and sunflowers, the Fibonacci sequence is everywhere. Pi, the famous mathematical constant representing the ratio of a circle's circumference to its diameter, is an irrational number, meaning it cannot be expressed as a simple fraction. Its decimal representation goes on indefinitely without repeating. Lastly, the number googol is a 1 followed by 100 zeros, and its even larger counterpart, googolplex, is a 1 followed by a googol of zeros. These astronomical numbers are unfathomably large and illustrate the vastness of the mathematical world.