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I switched to using a glue stick for mailing letters.

That's also a neat way of avoiding the "poisoned reply envelope" trick in case someone's trying to murder you

Or if someone doesn't want to marry you.

I can't help but think that there's easier ways to call off a wedding

I wonder if this has fine enough resolution to allow the wearer to input text by writing letters with their tongue.

If it can be used as a pointer, it can be used as textual input. People use existing tools like eye-tracking for text input.

So expect one as a stocking stuffer from the significant other?

—edit—

Mavis Beacon Teaches… umm, got nothing.

Ok, I’m done.