0/0 = NaN
1+ NaN =NaN
typeof 4
"number"
typeof 4.219837981273
"number"
0/0
NaN
typeof NaN
"number"
NaN * NaN
NaN
Variables are like labels for values
*we can store a value and give it a name so that we can:
refer back to it later
use that value to do stuff
or change it later one
let year = 1985;
