There Are Two Kinds Of Solar-heat Systems: "passive" Systems Collect The Sunlight That Hits Your Home, And "active" Systems Collect The Sunlight That Hits Your Neighbors' Homes, Too.

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There are two kinds of solar-heat systems: "passive" systems collect the
sunlight that hits your home, and "active" systems collect the sunlight that
hits your neighbors' homes, too.
-- Dave Barry, "Postpetroleum Guzzler"

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