30 minute naps are the most effective because it only uses the 2 light sleep stages, therefore you don't wake up as tired and you are more productive.
Memorizing songs is extremely healthy for the brain and will improve your mental capacity.
When someone new is hanging out with you and your friends , call your friends by their names so the new person has a chance to memorize them.
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Hack Your Life
RandomThis book is all about tips, tricks and hacks on : 1.How to make your life easier 2.How to get what you want 3.Psychological tricks to understand people better 4.How to win at everything 5.And lastly how to be the best.