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  1. Math

    Priming Upward

    A singular effort has turned up what is now the largest known prime number.

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  2. Astronomy

    Transit of Venus

    On June 8, Venus will pass across the face of the sun (as viewed from Earth). Such a transit occurs rarely; the last one was in 1882. A variety of Web sites feature information about these transits and offer advice for observing and timing the 2004 event. Go to: http://www.venustransit.ie/ and http://sunearth.gsfc.nasa.gov/sunearthday/2004/index_vthome.htm

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  3. Got Milk? Dairy protein provides bone-forming boost

    A protein in milk stimulates bone-forming cells.

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  4. Animals

    Turtle Trekkers: Atlantic leatherbacks scatter widely

    Satellite monitoring of leatherback turtles in the Atlantic show that these animals range widely instead of sticking to "turtle corridors."