Labor (6) Trabajo (6) Cognitive science (3) Science (3) Logic, Symbolic and mathematical (3) Ciencia (3) Lógica matemática (3) Ciencia cognitiva (3) science (3) Origin (2) Time (2) Senses and sensation (2) Property (2) Literature (2) Language and languages (2) Concepts (2) Origen (2) Lenguaje (2) Literatura (2) Sentidos (2) Propiedad (2) Tiempo (2) Evolution (Biology) (1) Tongue (1) Reading (1) Philosophy (1) Paper (1) Nature (1) Mythology (1) Metaphysics (1)