A hundred years ago, pioneer psychologist William James declared that humans use only a 【21】______ part of their potential. All too many of tasks are 【22】______ or tedious. Then the 【23】______ operates almost on idle. The result can be 【24】______ mistakes or dragged-out drudgery because we can't get with it. The perfect state of flow, Csikszentmihalyi explains, 【25】______ l when our skills exactly measure up to the challenges 【26】______ us. 【27】______ ,says Csikszentmihalyi, the way to get a dull but 【28】______ job done easily is to make it harder. Turn a boring task into a 【29】______ game, so than you 【30】______ all your potential. Invent rules, 【31】______ l goals, 【32】______ yourself against a clock. This increased challenge may be what 【33】______ you into your zone. I was once asked to write an 【34】______ to a 【35】______ l of articles on lawsuit. Words came slowly as I plugged away at a 【36】______ that didn't 【37】______ me. I made 【38】______ trips to the coffeepot. Then the magazine's art director phoned to say he'd created an eye-catching 【39】______ for the article. Could the first 【40】______ of the article begin with J? 【21】