If you aren’t in over your head, how do you know how tall you are? T.S. Eliot (via karenhurley) To shape human behavior, share this lesson on:Click to share on LinkedIn (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Pocket (Opens in new window)Click to share on Skype (Opens in new window)Click to share on Pinterest (Opens in new window)Click to email this to a friend (Opens in new window)