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A place for majestic STEMLORD peacocking, as well as memes about the realities of working in a lab.

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This is a science community. We use the Dawkins definition of meme.
It's within a percent.
The main substance that burns but doesn't necessarily get metabolized is dietary fiber, which is a category of some different polysaccharides that burn but don't get (fully) digested.
So high fiber foods would tend to give incorrect results in bomb calorimetry.