Science is a cemetery of dead ideas.

Unamuno’s aphorism frames science not as a static body of eternal truths but as a process that advances by discarding what no longer explains the world. In this view, each “dead idea” is a superseded theory, model, or explanation—preserved in the record of science much as a cemetery preserves the names of the departed. The line also carries an implicit warning: scientific knowledge is provisional, and intellectual progress often requires the courage to abandon cherished concepts. Coming from Unamuno, who frequently stressed the tension between rational systems and lived human needs, the image can also suggest that purely scientific rationality may feel cold or dehumanizing when it treats once-vital ideas as mere remains.