Ex-Google Tech Lead loses $350,000 in the stock market and lives to tell the tale. For fun daily problems on computer science, algorithms, math, science and engineering check out http://brilliant.org/techlead (the first 200 get 20% off premium to unlock dozens of interactive courses).
If you think you're so smart, then go play the stock markets and prove that you really are smarter. The experience will take you down a notch - keep yourself in check. Let me know your thoughts in the comments below.