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Devoted to the study of polyclad flatworms (Phylum Platyhelminthes, Class Turbellaria, Order Polycladida), a group of large, free-living marine Platyhelminthes ...

ancient skywatchers regulated their calendars and tracked days with celestial alignments, often sunrises and sunsets with targetted shadow and light features on ...

A free encyclopedia built collaboratively using wiki software. (Creative Commons Attribution-ShareAlike License).

Astronomy Group home page

Lightband Separation systems

AstroGuard -- dedicated to the preservation of life on Earth, through advance warning of asteroid or cometary impact

Includes information on research activities.

Watch full episodes of your favorite PBS shows, explore music and the arts, find in-depth news analysis, and more. Home to Antiques Roadshow, Frontline, NOVA, PBS ...