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Covering Up the Past

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    NEWSLETTERS

    Sharpie has combined the permanence of a pen with the erasability of a pencil with their new Liquid Pencil. The "ink" inside this pen is a liquid graphite that stays erasable for three days. After that, it turns to ink and stays permanent.

    It's a pretty neat trick! The pens go on sale starting next month for not much more than the price of a normal pen. The only downside is that, well, I never really use pens anymore. If only they had figured this out a decade or two ago!

    Sharpie via Gadget Lab