From The Writer's Almanac:
It's the birthday of philosopher Jacques Derrira born in El Biar, Algeria (1930). He's one of the founders of the theory of "deconstructionism," which he presented in the book Of Grammatology (1967). It assumes that there is no common intellectual structure or source of meaning that unifies a culture. When applied to literary criticism, it holds that a single text can have multiple meanings, which underlie and subvert the surface meaning of the words.