Old documentaries that clearly explain a topic

The Impossible Map - The problem of projecting a map of the Earth onto a flat surface

https://youtu.be/blQLjKzZbv4

Donald Duck in Mathmagic Land

https://youtu.be/U_ZHsk0-eF0

Spinning Levers - How a Motor Works

https://youtu.be/JOLtS4VUcvQ

5 lines for your .vimrc file

Makes working in vim nicer

set hlsearch    " highlight all search results
set ignorecase  " do case insensitive search
set incsearch   " show incremental search results as you type
set number      " display line number
set noswapfile  " disable swapfile