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NEW YORK ( TheStreet) -- It's terrific to invest in what you know, Jim Cramer told his "Mad Money" TV show viewers Monday. But for investors willing to stretch their imagination and learn what they don't know, there's even more money to be made. Cramer, broadcasting on location from the 2013 DreamForce conference in San Francisco, said many investors might not understand the cloud computing revolution, preferring to invest in old-line tech names such as Microsoft ( MSFT) or Cisco ( CSCO). But when mutual funds and money managers look for growth, they look toward cutting-edge companies with 30% to 40% growth, and those companies all live in the cloud. Investors must then choose whether they believe these companies, many of which have rich valuations by traditional metrics, are overvalued, or are the next big thing. Believing in the latter, as Cramer does, will involve leaving your comfort zone and taking on some additional risks. But the rewards for doing so can be astounding.