Yes, it’s from a book called “Uncle John’s Bathroom Reader” and that book was resting on a closed toilet seat in a nation that only kind of uses the metric system in certain situations… however, you’d be surprised how much you can learn after a single visit to any local fast-food joint!
It’s incredibly funny to me that the two metric units that the US actually commonly uses (calories and Watt-hours), aren’t SI units. Those are both measured with Joules.