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  1. Meeting Danielle the Tarantula

    Insect zoos have no lions, tigers, or bears but can give plenty of thrills, courtesy of tarantulas, giant beetles, and exotic grasshoppers.

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  2. 18984

    You missed the papers that describe our experiments that produce ball lightning in our lab. We use a lightning-arc-producing apparatus. Clint SewardElectron Power SystemsActon, Mass. The ball-lightning article makes no mention of Nikola Tesla’s creation of ball lightning while generating megavolt discharges from gigantic Tesla coil arrays. Ted V. PowellBaldwin, N.Y.

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  3. Physics

    Anatomy of a Lightning Ball

    Metallic fuzz, acid droplets, or other fairy dust may conjure up ball lightning (with video clips).

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  4. Math

    Euler’s Homework

    Even the best and most prolific of mathematicians have had to do homework assignments.