WASHINGTON — Technically speaking, Mark Freeman should count himself among the ­luckiest ­people on the planet. The 52-year-old lives with his family on a tree-lined street in his own home in the heart of the wealthiest country in the world. When he is hungry, he eats. When it gets hot, he turns on the air-conditioning. When he wants to look something up, he surfs the internet. One of the songs he likes to sing when he hosts a weekly karaoke evening is Johnny Cash’s ‘Man in Black

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