The Beatles once said “the love you take is equal to the love you make.” The energy leaving the heated part of a system is equal to the energy entering the cooler part of the system: Qcold = – Qhot. Can you find anywhere a more eloquent parallel to the fundamental law governing that mysterious concept known as love? Love is related to thermodynamics, and not simply because things tend to ‘heat up’ when that mutual attraction we call love comes into play, but because love is a valid physical force, right up there with gravity and electromagnetism. As for the proof of this revolutionary premise, its derivation is much too sophisticated for a text of this type. However, I will satiate some of your interest in my remarkabl