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The essay which I should have completed a week ago is due tomorrow. I'm running out of time and the only thing that is pushing me onwards is the ready supply of caffeine. 20 minutes pass without me realizing it, I go to grab my cup of tea on the side of the desk, and it's stone cold.
You plug this gadget in to your USB port, and it claims to extend your 'drinking time' (i.e. before the temperature requires your drink to be thrown down the sink and the kettle turned back on with a sigh) by 30 minutes.
The temperature of hot drinks can apparently be maintained at 40 degrees after an hour of use.