“You want a physicist to speak at your funeral. You want the physicist to talk to your grieving family about the Principle of Conservation of Energy, so that they will understand that your energy has not died. You want the physicist to remind your sobbing mother about the First Law of Thermodynamics: that no energy gets created in the universe, and none is destroyed. You want your mother to know that all your energy, every vibration, every joule of heat, every wave of every particle that was her beloved child remains with her in this universe. You want the physicist to tell your weeping father that amid the energies of the cosmos, you gave as good as you got.
“And at one point you’d hope that the physicist would step down from the pulpit and walk to your broken-hearted spouse there in the pew and tell him that all the photons that ever bounced off your face, all the particles whose paths were interrupted by your smile, by the touch of your hair — those hundreds of trillions of particles — have raced off like children, their ways forever changed by you. And as your spouse rocks in the arms of a loving family, may the physicist let him know that the photons that bounced from you and that were gathered in the particle detectors that are his eyes, that those photons have created within his brain constellations of electromagnetically charged neurons whose energy will go on forever.
“And the physicist will remind the congregation of how much of all our energy is given off as heat. There may be a few fanning themselves with their programs as she says it. And she will tell them that the warmth that flowed through you in life is still here, still part of all that we are, even as we who mourn continue the heat of our own lives.
“And you’ll want the physicist to explain to those who loved you that they need not have faith; indeed, they should not have faith. Let them know that they can measure, that scientists have measured precisely the conservation of energy and found it accurate, verifiable and consistent across space and time. You can hope that your family will examine the evidence and satisfy themselves that the science is sound and that they will be comforted to know that your energy is still around.
“Because, according to both the First and Second Laws of Thermodynamics, not one bit of you is gone: you’re just less orderly.”
Original author unknown. Quoted by ‘WelshmanEC2’ in The Guardian http://www.theguardian.com/commentisfree/2014/feb/14/below-the-line-people-angry-science-astronomy-enthusiast [accessed 14/2/14]. NB: some minor stylistic amendments made in the version presented here.
Update: the original author is Aaron Freeman who performed it on NPR Radio in 2005. Original transcript here. Audio of performance (with added slideshow) here.