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Live in a cave: 6 cool housesWant to stay cool this summer? Try living in a cave. Or a boulder. Six crazy cool houses for sale. More
Own in the Playboy mansionHugh Hefner's original palace, located on Chicago's Gold Coast, is now condos -- and one is for sale for $2.9 million. More
High life on the high seasJust as the world's biggest cruise ship, Oasis of the Seas, took its maiden voyage, plans were announced for the world's most luxe ocean liner: The Utopia. More

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Driving the world's first car Driving a replica of the 1886 Benz Patent Motorwagen, the first internal combustion automobile. More
The 7 biggest investment mistakes celebrities make From betting too heavily on real estate to overestimating future earnings, here are 7 of the most common money mistakes that celebrities make. More
Cotton candy, toothpicks, pet gel -- these products are all made from marijuana Legal cannabis, an estimated $5.4 billion industry, is drawing in entrepreneurs with a variety of innovative products -- from skin patches to pain relief gel for pets. More
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