Did you know that ALL the numbers you have ever used positive, negative, fractions, decimals, √2, and π belong to one grand family called Real Numbers? The real number system is like a complete map: every number that can be placed on a number line is real. Today we bring the entire number family together, understand how they relate like nesting boxes, and discover why mathematicians chose the word "real" a surprisingly philosophical choice! Which member of the number family do you think is the most important? Let's map the full universe of numbers together!