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Science

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  • Gem Bottles
    GEOCENTRAL

    Gem Bottle

    $2.99

    Each labeled glass bottle holds tiny chips of a particular mineral. Some natural, some color enhanced. Sold individually. For information on specif...

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  • Grabber Bot
    Grabber Bot
    copernicus

    Grabber Bot

    $34.99

    Think of this as an analogue robot. Wood and string combine to make a precision grabbing device. The builder controls the bot with levers and str...

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