Obviously, some academic fields are considered more difficult than others - for instance, physics might be considered more difficult than geology. However, there must be people who find geology (and its fellow "easier" fields) to be much more difficult than "difficult" fields. Similarly, state tests tend to be curved so that they all end up with about the same grade spreads, even if it means making a test harder or more difficult from year to year, so it is hard to tell from these examples what is actually difficult. So, can an academic topic be objectively difficult?