The All-new Profession

Telling green from "green" may require a professional discipline which has yet to be established. To see why, try this <a href="http://cyberschoolbus.un.org/waterquiz/waterquiz4/quiz/quiz.html">elementary school quiz</a>. כיצד מבחינים בין ירוק ל"ירוק"? התחום המקצועי העוסק בכך טרם התמסד.