1. How to Select the Hacks
   1. Search "Learning Hacks" on Google
   2. Summarize all the hacks and # of mentions
   3. Exclude hard-to-execute ones
   4. Search in Google Scholar
   5. Exclude methods without clinical testings
2. Best Hacks
   1. Good sleep
   2. Proper exercise
   3. Testing
3. Weak Connection with Cognition Enhancement
   1. Game
   2. Meditation
   3. Brain-boosted Diets
   4. Music
4. For Maturely Developed Domains
   1. Deliberate Practices
5. Short-term Cognition Boost
   1. Caffeine
   2. Nicotine
6. Improve Memory
   1. Spaced Repetition
   2. Interleaving
   3. Longhand Note-taking
   4. Mind Map
   5. Teaching
   6. Improvement on Reasoning
7. Possible Side Effects