This is the first Economic Policy which boost something different than File:Civ6Gold.png Gold or File:Civ6Production.png Production. Natural Philosophy is naturally more efficient the more Campuses you have, but not only that - it also becomes progressively more efficient the larger their Adjacency bonuses! For example, a Campus with a bonus of +1 will gain another 1 from this Policy, for a total of 2; while a Campus with a bonus +3 will reach a total of 6! Since in Civilization VI every single point of a yield type counts, and most of the time the gain is not proportionate, but absolute, then Natural Philosophy will only be worth it if you have more than 1 Campus, and/or if your Campuses have good Adjacency bonuses! Otherwise, it won't be worth it to spend an Economic slot just to gain a