Philosophy
The Logic of Vagueness and Supervaluationism
Quick fact
Supervaluationism, developed mainly by Bas van Fraassen and Kit Fine, treats a sentence like 'This is red' as true only if it is true under every acceptable way of making the vague term precise. This lets it avoid the sorites paradox while still preserving the law of excluded middle.
Why this is interesting
Have you ever wondered whether a person with 100 hairs is bald? What about 1,000? At what exact number does 'bald' become false? This puzzle of vague language seems to break classical logic—but supervaluationism finds a way out.