Hello, I had never heard of "entanglement" (in regards to particles) until today when I read an article on it in Discover Magazine (July-August 2016, p.68). I searched for and found several threads here, but were too advanced to understand and/or did not seem to address my questions below. BTW, have only had under-graduate physics & math for a BS in Microbiology (1972). What distance is one particle theoretically able to be entangled with another? How can they be said to be entangled if trillions of other particles separate them? Thanks in advance.