Well, hold on. I don't think the condescension is warranted given that the idea of a "source" refers to attributing where some piece of information comes from.

Well, hold on. I don't think the condescension is warranted given that the idea of a "source" refers to attributing where some piece of information comes from. Consider Wikipedia's policy of verifiability, that requires all pages' material to be verifiable, but not necessarily cited. If you are interested enough, just try to find those USDA numbers online!