- lecture 1 - array basics
 - lecture 2 - creating arrays
 - lecture 3 - indexing 1d arrays
 - lecture 4 - indexing multidimensional arrays
 - lecture 5 - basic math for arrays
 - challenge 1 - high school reunion
 - challenge 2 - nola
 - challenge 3 - gold miner
 - challenge 4 - roux
 - lecture 6 - broadcasting
 - lecture 7 - newaxis
 - lecture 8 - reshape
 - lecture 9 - boolean indexing
 - lecture 10 - nan
 - lecture 11 - infinity
 - lecture 12 - random
 - challenge 5 - love distance
 - challenge 6 - pscyho parent
 - challenge 7 - professor prick
 - lecture 13 - where
 - lecture 14 - math functions
 - lecture 15 - any and all
 - lecture 16 - concatenate
 - lecture 17 - stacking
 - lecture 18 - sorting
 - lecture 19 - unique
 - challenge 8 - movie ratings
 - challenge 9 - big fish
 - challenge 10 - taco truck
 - challenge 11 - defraud the investors
 - challenge 12 - pixel artist
 - lecture 20 - advanced array indexing
 - lecture 21 - view vs copy
 - challenge 13 - population verification
 - challenge 14 - prime locations
 - challenge 15 - game of doors
 - challenge 16 - peanut butter