Nighttime illumination at the lincoln Memorial attracted millions of midges, and spiders that fed on the midges, and sparrows that fed on spi-ders. Scrubbing away the bird droppings and spider webs made the marble vulnerable to exhaust particles. A modern technology, the jet airliner, has democratized tourism, enabling millions to travel to see Michelangelo's restored frescoes in the Sistine Chapel, where the heat of the visitors' bodies and the vapor in their breath combine with dust in the air to produce indoor acid rain. Warm, humidified, insulated and carpeted modern homes are comfortable not only for humans but also for fleas, which probably outweigh people on this planet.
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