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Until the early 1960s, when midden analysis was born, there were very few clues to the desert’s past.

Pack rat fever began in 1961, when a young plant ecologist named Phil Wells and a young mammalogist named Clive Jorgensen set out on a hike up Aysees Peak in Nevada’s Mojave Desert.

Back in his office, Van Devender hands over a 14,000-year-old piece of the stuff. A brick-size midden can yield as many as 100 different plants and animals: up to 60 shrubs, cacti, and grasses, 25 insect groups, and 15 different vertebrates.As the Waterman display amply demonstrates, pack rats do their business in their dens, and in arid regions the excretions can accumulate into rock-hard masses, called middens, that persist for thousands of years. Whatever happens to be lying about the den also gets mixed in: grasses, twigs, leaves, spines, seeds, feathers, rocks, bugs, bones.The concoction is protected by the pack rat’s urine, which acts as a bactericide, so the organic matter doesn’t decompose.Today scientists suspect that some middens might be even older, but their ages can’t be verified.Not to worry, though; 40,000 years of fossils can keep naturalists busy for decades to come.




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“Ezra’s done a great job with S2 this year,” said Schmetzer.“Some of these early-round Open Cup games, you never know who exactly is going to start, so can you fully scout them, can you do a full dossier about their team?