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