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[–] • 0 pt

Thermos

[–] • 0 pt

Analog tech. Not a bad idea.

[–] • 0 pt

Sometimes if it ain’t broke don’t fix it.

[–] • 0 pt

I could just wrap a cup in heat tape and stick a battery on there. Also RGB leds with a color shift pwm chip, a lighter, pez dispenser, and can opener.