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  1. 19628

    In this article about using harmonic reflected signals to track bees, I thought it was interesting to note that the original technology was created by the Russians as a spy device. The technology is still being used for a form of spying. Dwight ElveySanta Cruz, Calif.

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  2. Animals

    The Trouble with Chasing a Bee

    Radar has long been able to detect high-flying clouds of insects, but it's taken much longer for scientists to figure out how to track your average bee.

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  3. Math

    Light Bulb Puzzles

    Light bulbs and switches combine to present infinite perplexities.

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  4. Humans

    From the January 4, 1936, issue

    Experimental rockets, a tuberculosis-fighting bacteriophage, and an antidote for barbiturate poisoning.