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  • 25 Apr 2000

    What may look from the air like a blazing oil slick can turn out to be a kilometers-long carpet of marine algae, their luminous bodies setting the ocean aglow.

  • 9 Mar 2000

    Though it was dogma for decades, the notion that tool-making distinguishes humans from other animals turned out to be a flattering delusion. But of all the animal artisans, only humans seemed to shape tools according to a set pattern and with a favored hand.

  • 20 Jan 2000

    Diseases like multiple sclerosis and amyotrophic lateral sclerosis (ALS) often erode nerves for years before paralyzing or even killing their victims.