Voting rules: Choose the concept you think is the most difficult!
This is a community-based ranking of the most difficult concept to understand. We do our best to provide fair voting, but it is not intended to be exhaustive. So if you notice something or concept is missing, feel free to help improve the ranking!
A participant may cast an up or down vote for each concept once every 24 hours. The rank of each concept is then calculated from the weighted sum of all up and down votes.