I find the conceptual implications of the above quotation (and the Wikipedia definition of entanglement) captivating. It comes from a book on the history of quantum physics which I am currently (if somewhat guiltily) enjoying. Like most non-fiction books, this one is also organized much too chronologically for my taste. However, the author has done a beautiful job of grounding the development of quantum theory in the daily lives of those through whom it was revealed to the world. She also does a brilliant job of reconstructing conversations from historical documents in a way that highlights the significant influence the scientists' personal and social "entanglements" had on theoretical developments in the field of physics.
It is interesting to consider the degree to which we are consciously aware of our "entanglement" with others, the relative strength of each of those connections, and how intensely the connections persist in the face of prolonged separation (due to death, the decay of a friendship, divorce, or simply increased absence from the realities of one another's normal, daily routines). Have you ever spent time trying to isolate and unravel the "entanglements" that are most persistent in your life? Are there people who are no longer physically part of your daily routine with whom you continue to be deeply entangled (in terms of the influence they exert on your thoughts and actions)? Do you ever wonder why THOSE particular people seem to have such a disproportionate influence within your sphere of existence?
From an alternative perspective, have you ever wondered what noticeable effect your individual existence has on the rest of the world? Do you ever ponder whether the brief comments, insignificant interactions, or trivial activities in which you engage affect anyone else in deep and lasting ways? Have you ever thought about the degree to which the effect of those tiny expressions of self may be magnified by their absence in someone else's life? Have you ever considered the effect that your unspoken musings would have on the world if you were to share "the real" you with more of the world? Conversations about the concept of entanglement merit a much greater investment than the time and space inherent in a midnight blog post. For now, I'll suffice to say that the manner in which we live would surely change if we truly believed and viewed ourselves as connected to others and our environment in physical ways.
Gilder, Louisa. (2008). The age of entanglement: When quantum physics was reborn. NY: Alfred A. Knopf.