Or...one, or all of these:
1.Learn a Second Language 2. https://projecteuler.net/archives 3. http://rosalind.info/problems/list-view/
If you are going to exercise your brain, you might as well get smarter and learn useful skills in the process.
1.Learn a Second Language 2. https://projecteuler.net/archives 3. http://rosalind.info/problems/list-view/
If you are going to exercise your brain, you might as well get smarter and learn useful skills in the process.
One might argue that that's the only way to actually exercise your brain.