“考える”という行為の本質を読み解いて、むずしい問題に対する有効な解決策を導き出していく「ロジカルシンキング」の定番書。
Faceboo auth is required to view user page.
If you have logged in since, it's automatically executed. If first time, Facebook auth login page will be shown, after your authorization, you can access user page.