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So you've packed your bags, loaded your van, and are ready to join the "Green Rush" along with thousands of others looking to try their luck at opening and running successful marijuana dispensaries and businesses in states like Arizona, Colorado, Georgia, Alaska and others. The business is big: According to CNBC, the marijuana industry in the U.S alone is worth an estimated $45 billion and it continues to grow.

Looking to some of the world's greatest thinkers and inspiring leaders, Brooks explores how, through internal struggle and a sense of their own limitations, they have built a strong inner character. Labor activist Frances Perkins understood the need to suppress parts of herself so that she could be an instrument in a larger cause. Dwight Eisenhower organized his life not around impulsive self-expression but considered self-restraint.