If there's a name I trust when it comes to writing implements, it's Sharpie. Their newest creation is the Liquid Pencil, a smooth-writer that gives you a few days to erase your work before it becomes set in stone.
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Think of it as the yin to the erasable pen's yang. Sharpie claims that their new Liquid Pencil writes as smoothly as a pen, erases just like a pencil, and becomes permanent like a Sharpie marker after a few days.
Seems like it could be useful for those who are prone to self-correction but worry about Father Time getting the best of their penciled notes. Also, this way you'll have a few days to react when it explodes in your pocket. [Sharpie via Wired]