Full Idea
If you say 'an owl should be able to see in the dark' …you're not going to think that there's a gap between facts and evaluation.
Gist of Idea
There is no fact-value gap in 'owls should see in the dark'
Source
Philippa Foot (Interview with Philippa Foot [2003], p.33)
Book Reference
-: 'Philosophy Now' [-], p.33
A Reaction
I take this to be a major and fundamental idea, which pinpoints the failure of Humeans to understand the world correctly. There is always total nihilism, of course, but that is a sort of blindness to how things are. Demanding 'proof' of values is crazy.