My triglyceride numbers went down 50 points at my last physical.

Dogs can distinguish two very similar fatty acids, extremely diluted caprylic acid and caproic acid.

Now, there's another fatty acid, capric acid, which is just like the other two, except that it has two more carbon atoms.

A dog that had never met capric acid would, perhaps, have no more trouble imagining its smell than we would have trouble imagining a trumpet, say, playing one note higher than we've heard a trumpet play before.