Can anyone please suggest any usual,unusual activity to learn apart from practicing cp.
eg.(learning touch typing,writing blogs,doodling,etc…)
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If you are looking for something challenging , try to learn Vim.
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I am looking for something useful. Any suggestions? 
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Learn to solve Rubik’s cube if you haven’t.
Learn Japanese to become capable of watching 
anime without having to worry about looking at subtitles during interesting scenes. 
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Try Writing some tutorials/ editorials. Or creating some problems. If you understand some topic very well, you shouldn’t have issues while doing these. If you face problems, there is still to learn something about the topics. 
Quantum mechanics! It will blow your mind. Regarding CS, you can focus on topics related to quantum computing
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