The most-loved lines from John Gribbin, drawn from 1 book in the library.
Lines labelled “HourLife takeaway” are our wording of the book’s ideas and may paraphrase it. Only lines in quotation marks are the author’s own words, with where they appear. Check the book for exact wording before you quote it. Spot an error?
Nobody argues about what quantum theory predicts; the fight is over what is really going on.
The equations of quantum mechanics have passed every experimental test so far, to great precision. The interpretations are different stories about the same results. That is why Gribbin can treat all six side by side: none of them is ruled out by an experiment yet.
Every way of making sense of the quantum world asks you to accept one thing that sounds impossible.
The title borrows from the White Queen in Through the Looking-Glass, who practises believing impossible things before breakfast. Gribbin's point is that all six interpretations are crazy in some way. Some are crazier than others, but in the quantum world, crazier does not mean more wrong.
Send particles through two slits one at a time, and they still build up stripes that only waves should make.
Each particle lands as a single dot. Yet after thousands of them, the dots form an interference pattern, as if each one had passed through both slits. Put a detector at the slits to see which way each particle went, and the stripes disappear. Every interpretation in the book has to explain this.
The Copenhagen view tells you to stop asking what a particle does when nobody is looking.
This is the interpretation associated with Niels Bohr, and the name came from Werner Heisenberg. The wave describes what you can know, and a measurement turns the spread of possibilities into one result. It became the textbook answer, and Gribbin shows how much it leaves unexplained.
In the pilot-wave picture the particle always has a real path, steered by a real wave.
Louis de Broglie proposed the idea in the 1920s, and David Bohm revived it in the 1950s. The wave goes through both slits and the particle through one, guided by the wave. The price is that the wave links everything at once, so what happens here depends on the whole set-up, however far apart its parts are.
Many worlds removes the collapse of the wave, at the cost of every possible outcome being real somewhere.
Hugh Everett's idea from the 1950s keeps the equations exactly as they are and never lets the wave collapse. Instead, each measurement splits reality into branches, one for each outcome. It is the simplest maths and the largest universe.
Decoherence explains why the everyday world looks single and solid, even if the quantum world underneath is not.
A quantum system is never truly alone. Air, light and the measuring device all interact with it, and that contact washes out interference very quickly. The question this leaves open is why you then see one particular outcome.
The ensemble view says the wave describes a long run of experiments, never a single particle.
An ensemble can be many identical trials, such as one electron sent through the same set-up a million times. Read that way, quantum theory is statistics and nothing more, which is why it is called a non-interpretation. It looks sensible until the system starts to interact with the world around it, and puzzles such as the watched pot, where a closely watched system does not change, start to bite.
The transactional view lets waves run backwards in time, so every event is a handshake between past and future.
Physicist John Cramer's interpretation has an offer wave going forward from the source and an answering wave coming back from where the particle will land. Where they meet, the transaction is complete. The equations allow waves in both directions of time; this view takes both seriously.
HourLife turns these ideas into a daily system — goals, habits, focus, and reflection in one private place.
