If you want to enable your users to do something, such as create an account on your system, DO NOT MAKE IT IMPOSSIBLY HARD.
If algebra is too hard, just refresh and you’ll see something else.
Woah, better refresh.
You know what this does? It not only keeps out any bots, but turns a normal human into something else:
With a zillion other websites out there, are you sure yours is compelling enough or contains such rare information that people will jump the gorge to get to it?
https://www.youtube-nocookie.com/embed/P7vte1epVpE?rel=0