Task: Text Categorization
Input (English): In one of this philosophers works, he advocates a Galilean cosmology, and in the same work, he wrote about the study of light refraction in Dioptrics. One thing named for this philosopher consists of the admonitions to admit as true only what was so perfectly clear and distinct that it was indubitable, and to make such accurate enumerations of the steps of reasoning so as to be certain of having omitted nothing, known as his method of doubt, and which can be found in Meditations on First Philosophy. For ten points, identify this philosopher, whose best known for his work Discourse on Method and the statement of existence Cogito ergo sum.
Output (English): Social Science