Lyric discussion by Uber_Geek 

The full title of this song is 'Nailing Descartes to the Wall/(Liquid) Meat Is Still Murder'.

Rene Descartes was a 17th century philosopher who postulated that animals are merely biological machines who cannot suffer or feel pain, and that any reaction they might have is purely mechanical. Descartes is at least partly responsible for the prevalence of this view at at the time. As a result vivisection was carried out without anaesthetic for many years, and indeed is still carried out today.

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