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  1. Math

    Prepping for Calculus

    The “Calculus Page” Web site provides links to a variety of resources for calculus students and teachers, from problem sets with step-by-step solutions to tips on preparing for exams. Linked sites offer online tutorials and courses, sample exams, animated examples, mathematical software, and information on calculus competitions and the history of calculus. Go to: http://www.calculus.org/

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  2. Earth

    El Niño: It’s back!

    An increase in ocean temperatures in the central Pacific heralds the onset of El Niño, whose effects should show up in the United States this fall.

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  3. Malaria parasite reveals old age

    The DNA of a malaria-causing parasite suggests it is at least 100,000 years old.