Sentence:  Even more jaw-rattling is the problem of what is being called the "<WSD>hyperloop</WSD>." The Helmholtzian view of mind — that it is exhaustively explainable in terms of the electrochemical activity of brain — is a solid article of faith for most well-dressed scientists, for all practical purposes, even if they also have religious opinions which include immortal souls, divine sparks, and the like: those are strictly idiosyncratic contraband and belong in a different box. But in modern physics, our definitions of matter-energy and space-time require the insertion of mind as a primitive component: the brain consists of the particulars it observes. 
Meaning of the word marked with <WSD> tags:  A quantum mechanical paradox resulting from the observer being a product of the observations that it makes.