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Sikap pikiran ini - sikap ketidakpastian - sangat penting bagi ilmuwan, dan sikap pikiran inilah yang pertama-tama harus diperoleh siswa. Itu menjadi kebiasaan berpikir. Setelah diperoleh, kita tidak dapat mundur darinya lagi. Asli: This attitude of mind - this attitude of uncertainty - is vital to the scientist, and it is this attitude of mind which the student must first acquire. It becomes a habit of thought. Once acquired, we cannot retreat from it anymore.
