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Clark’s nutcrackers face lean, hard times


Field observations suggest that each nutcracker caches 30,000 limber pine seeds in late summer and fall and then recovers about 15,000 of them to get through the winter. Unrecovered seeds germinate and grow. The nutcracker effectively charges the tree one seed for the service of planting one seed.

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Ring muhly, a clonal grass that forms rings


Ring muhly, Muhlenbergia torreyi, is a clonal species that starts out as a small clump that increases in diameter over the years. That is, a clump of the grass is not a series of individuals, but a single individual.

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Could contrails influence our climate?


Contrails from jet engines can coalesce and form man-made clouds. These contrail clouds can affect the weather, but their effect on climate change is uncertain.

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Moth caterpillars devour pine trees


The Douglas-fir tussock moth is a native to western North America, and its geographic range is coincident with the range of Douglas-fir; both species are found in British Columbia, all of the western states and the mountains of Northern Mexico. Locally, the preferred host seems to be Douglas-fir, for about a decade ago an infestation killed many Douglas-firs on the north-facing slopes of the canyons west of Boulder.

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How CU helps boost U.S. competitive edge


Educational innovation is core to CU-Boulder’s mission. Recent years have seen particularly rapid changes in education in the so-called STEM fields (Science, Technology, Engineering and Mathematics).

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