Lyric discussion by scooper 

"shelf life" expands on the theme of dystopic bioengineering first explored in "valhalla's celtic robbie," on 'brown.' ("the patent is applied for" is a line from that song.) at the time "shelf life" appeared, genetically modified foods -- pesticide-resistant soybeans, for instance -- were just starting to appear in a mass scale, and the left was just starting to rally around opposition to them. GM is now fairly common in agriculture, though opposition continues to be voiced, but the paranoia on display here can be easily extended to the era of cloning and genetic modification of animals and humans (gene therapy, pharmaceuticals research, etc.).

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