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The Uncertainty Principle states that you can know where a particle is, or you can know where it's going, but you can't know both at the same time. The same, it turns out, is true of people. And when you try, when you look too closely, you get the Observer Effect. By trying to work out what's going on, you're interfering with destiny. A particle can be in two places at once. A particle can interfere with its own past. It can have multiple futures, and multiple pasts. The universe is complicated.

Harriet Reuter Hapgood
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The Uncertainty Principle states that you can know where a particle is, or you can know where it's going, but you can't know both at the same time. The same, it turns out, is true of people. And when you try, when you look too closely, you get the Observer Effect. By trying to work out what's going on, you're interfering with destiny. A particle can be in two places at once. A particle can interfere with its own past. It can have multiple futures, and multiple pasts. The universe is complicated.

Harriet Reuter Hapgood, The Square Root of Summer
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The bridge between the electron and the other elementary particles is provided by the fine structure constant, a ~ 1/137, as manifested in the factor-of-137 spacings between the classical electron radius, electron Compton radius, and Bohr orbit radius. ... An a-quantized mass-generation grid extends accurately from the electron all the way to the top quark t, and leads to a corresponding a-quantized particle lifetime grid.

Malcolm H. Mac Gregor, The Enigmatic Electron: A Doorway to Particle Masses
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‎In modern physics, there is no such thing as "nothing." Even in a perfect vacuum, pairs of virtual particles are constantly being created and destroyed. The existence of these particles is no mathematical fiction. Though they cannot be directly observed, the effects they create are quite real. The assumption that they exist leads to predictions that have been confirmed by experiment to a high degree of accuracy.

Richard Morris
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Another very good test some readers may want to look up, which we do not have space to describe here, is the Casimir effect, where forces between metal plates in empty space are modified by the presence of virtual particles.Thus virtual particles are indeed real and have observable effects that physicists have devised ways of measuring. Their properties and consequences are well established and well understood consequences of quantum mechanics.

Gordon L. Kane
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Heisenberg's uncertainty relation measures the amount by which the complementary descriptions of the electron, or other fundamental entities, overlap. Position is very much a particle property - particles can be located precisely. Waves, on the other hand, have no precise location, but they do have momentum. The more you know about the wave aspect of reality, the less you know about the particle, and vice versa. Experiments designed to detect particles always detect particles; experiments designed to detect waves always detect waves. No experiment shows the electron behaving like a wave and a particle at the same time.

John Gribbin, In Search of Schrödinger's Cat: Quantum Physics and Reality
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Knowing that a particle can occupy two different states at the same time—a state known as superposition—and, two particles, such as two particles of light, or photons, can become entangled, means that there is a unique, coupled state in which an action, like a measurement, upon one particle immediately causes a correlated change in the other.If there is a better word to describe my relationship with Fanio than entangled, I have yet to hear it. Even when the two entangled particles—or people—are separated by a great distance (and I mean emotional or physical distance, such as mine with Epifanio, or like being at opposite ends of the universe), their movements or actions affect each other. Yet, before any measurements or other assessments occur, the actual "spin states" of either of the two particles are uncertain and even unknowable.

Sally Ember
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The bridge between the electron and the other elementary particles is provided by the fine structure constant. ... An expanded form of the constant leads to equations that define the transformation of electromagnetic energy into electron mass/energy, ...

Malcolm H. Mac Gregor, The Enigmatic Electron: A Doorway to Particle Masses
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You want a physicist to speak at your funeral. You want the physicist to talk to your grieving family about the conservation of energy, so 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 Btu of heat, every wave of every particle that was her beloved child remains with her in this world. You want the physicist to tell your weeping father that amid 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 brokenhearted 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, hundreds of trillions of particles, have raced off like children, their ways forever changed by you. And as your widow rocks in the arms of a loving family, may the physicist let her know that all the photons that bounced from you were gathered in the particle detectors that are her eyes, that those photons created within her 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 he says it. And he 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 your family will examine the evidence and satisfy themselves that the science is sound and that they'll be comforted to know your energy's still around. According to the law of the conservation of energy, not a bit of you is gone; you're just less orderly. Amen.

Aaron Freeman
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the Z-particle Pure energy—no mass at all. It may well be thesmallest building block in nature. Matter is nothing but trapped energy.

Dan Brown, Angels & Demons
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String theory is an attempt at a deeper description of nature by thinking of an elementary particle not as a little point but as a little loop of vibrating string.

Edward Witten
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