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Geologists rely on tiny crystals of the mineral zircon to understand the timing of key events in Earth's early days, like the rising of continents and the emergence of oceans.
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Vacationers staying in central Florida awoke to crashing sounds Sunday night, as their three-story building began to collapse. A large portion of the structure at a resort in Clermont was pulled into a sinkhole. It seems the process was slow enough that everyone in the building got out safely.