''When a visitor enters Bill Gates’ house, the person is surveyed and given a pin or microchip to wear at all times inside the estate. This helps the sensors in the house to interact with the chip and the person can set the ambience according to his wish and when he enters the room, the temperature and lighting change according to his/her liking.''

http://deveev.com/news/8-amazing-and-unknown-facts-about-the-house-of-bill-gates-which-will-you-stunned/5/

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