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  1. Planetary Science

    Red Planet Roundup: Opportunity knocks; Spirit revives

    The NASA rover Opportunity bounced onto an equatorial Martian plain early on Jan. 25 and found an intriguing outcropping of rocks on the other side of the planet from where its ailing but recovering twin, Spirit, had recently stalled.

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  2. Humans

    Letters

    Letters from the Jan. 31, 2004, issue of Science News.

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  3. Materials Science

    Flexible E-Paper: Plastic circuits drive paperlike displays

    In a major step toward electronic paper, researchers have made electronic-ink displays on flexible plastic sheets.

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  4. Physics

    Skipping stones 101

    Using their own stone-skipping machine, physicists have found what may be the best angle for a rock to hit the water in order to achieve the most skips.