*This terminology differs slightly from that of Dawkins. Anything that is copied, for whatever reason, he calls a replicator. What I call a replicator he calls an ‘active replicator’.

*These are not the ‘parallel universes’ of the quantum multiverse, which I shall describe in Chapter 11. Those universes all obey the same laws of physics and are in constant slight interaction with each other. They are also much less speculative.