Which is your favourate hobby?

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There was one High Court Judge in my place. His hobby was to read medical journals regularly. Although he had not studied medicine, he could deliver good judgements in medical cases. One foreign university has also honored him for his contibution to medical field. One of my friend who is a pshycriatist is having deep knowldge about "Rig Veda" and he presented a thesis connecting veda psyocology in another country. I am interested in learning astrology and I am also doing a project in compiling Karnatic Music "raga-wise" for the music students or other lay men. What are your hobbies other than reading, playing and writing?