Siphonophores do not convey the message a favorite theme of unthinking romanticism that nature is but one gigantic whole, all its parts intimately connected and **interacting** in some higher, ineffable harmony. Nature revels in boundaries and distinctions; we inhabit a universe of structure. But since our universe of structure has evolved historically, it must present us with fuzzy boundaries, where one kind of thing grades into another.

— "A Most Ingenious Paradox", p. 95

We have to stop **interacting** so closely with wolves. It is wrong, the risk is too great. We must recognise they are dangerous animals.

— Arne Weise, as quoted in Chris Pollard, "Wolves maul woman to death at zoo in Sweden",

One of the most frequently mentioned equations was Euler's equation, Respondents called it "the most profound mathematical statement ever written"; "uncanny and sublime"; "filled with cosmic beauty "; and "mind-blowing". Another asked: "What could be more mystical than an imaginary number **interacting** with real numbers to produce nothing ?" The equation contains nine basic concepts of mathematics once and only once in a single expression. These are: e (the base of natural logarithms); the exponent operation; ?; plus (or minus, depending on how you write it); multiplication; imaginary numbers; equals; one; and zero.

— Robert P. Crease, in "The greatest equations ever" at PhysicsWeb (October 2004)

One of the most frequently mentioned equations was Euler 's equation, Respondents called it "the most profound mathematical statement ever written"; "uncanny and sublime"; "filled with cosmic beauty "; and " mind -blowing". Another asked: "What could be more mystical than an imaginary number **interacting** with real numbers to produce nothing ?" The equation contains nine basic concepts of mathematics once and only once in a single expression. These are: e (the base of natural logarithms); the exponent operation; ?; plus (or minus, depending on how you write it); multiplication; imaginary numbers; equals; one; and zero.

— Robert P. Crease, in "The greatest equations ever" at PhysicsWeb (October 2004)

In 1925, the world view of physics was a model of a great machine composed of separable **interacting** material particles. During the next few years, Schrodinger and Heisenberg and their followers created a universe based on super imposed inseparable waves of probability amplitudes. This new view would be entirely consistent with the Vedantic concept of All in One.

— Erwin Schrödinger in

A complex adaptive system is composed of **interacting** 'agents' following rules, exchanging influence with their local and global environments and altering the very environment they are responding to by virtue of their simple actions.

— Sherman, H. and Schultz, R. (1998)