Kazuaki Ohashi, 37, is a philosopher whose love of a challenge has propelled him from studying the fear of death to a life of business and parties. CEO of Web design firm Koo & Co., and EN, an English language school, he is also the volunteer organizer of events that introduce traditional Japanese dance abroad and foreign folk dance to Japan. Despite working from 8 a.m. till 2 a.m., six days a week, he thinks that so far he hasn't done much more than maybe taken a few steps in the right direction.

Always be good because it could all end any second. When I say goodbye to a friend, I always wonder if we will see each other again or if that will be the last time we will ever speak.

If you know something, you must teach it, too. Just like Plato wrote in "The Republic," many people mistake shadows for reality. The person who sees through this all has the responsibility to enlighten others.