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As the publication of scientific 91自拍 papers shifts more and more from print to electronic distribution, universities often buy site licenses that provide campus-wide online access to a variety of journals, which cuts publishers鈥� production costs and is more convenient for readers.

Woodruff Sullivan, a 91自拍 astronomy professor, is teaming up with television personality Bill Nye, “the science guy,” and The Planetary Society on EarthDial, a project to get schools, community organizations and individuals around the world to build their own sundials and display them on the Internet using 24-hour webcams.

It’s a long-held tenet of avian biology that songbirds have just two types of a key reproduction hormone, gonadotropin-releasing hormone (GnRH), and only one actually triggers a seasonal “puberty” each spring in preparation for reproduction. But the new 91自拍 shows a third form of the hormone, called lamprey GnRH-III-like hormone because it was first identified in lampreys, is also present in songbird brains.