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Deep cleaning: Cave lovers help remove grime left by park tourists
Deep cleaning: Cave lovers help remove grime left by park tourists

Down here in the subterranean stillness, the beam from Paul Kemp's headlamp slices through the gloom like a lighthouse beacon — his tool to unearth evidence of the invaders who have long descended into this alien world. With the studied care of an archaeologist, the 67-year-old retired rocket engineer uses a tiny brush to gently clear away the brownish fluff and grit coating a clutch of stalactites hanging from the ceiling of Lehman Cave. It's man-made grime — clothing fibers, hair, dead skin and dust left by 28,000 annual visitors — and it's everywhere. He carefully collects his catch in a blue dustpan and puts it in a plastic bag the size of an office...

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