*The retrosignaling described below does not lead to paradoxes like the grandfather paradox because of its stochastic nature.*

From **A**, many possible paths with **A** as the source are generated. This are the possible paths of a particle originating from **A**.

The paths end up at possible endpoints **B**[1], **B**[2], … . Each **B**[i] could be the endpoint for several paths. (In a path-integral formulation, each path “carries” on a channel a (changing) unit (circle) complex number (UCN).

From each **B**[i], retrosignals (backwards-in-time signals) are sent on path backchannels to **A**. (These are “weights” – computed as the modulus of the sum of UCNs received at **B**[i] – carried by each path backwards in time to **A**.

**A** gets all these retrosignalled weights (effectively resulting in a probability distribution on all paths) and selects a single path. (This occurs at the very same time that it generated the paths.)

Result: There is only one **B**[i*], and only one path leading to **B**[i*].

The paths are like **A**‘s litter (of children). It gets signals from the future on the prospects for each child. **A** kills off all its children but one. *The quantum substrate is a cruel world.*

In the EPR experiment (where a source **S** transmits a particle with a path to endpoint **A** and transmits a particle with a path to endpoint **B**): A signal with information about **A** is backchanneled on the first path to **S**. A signal with information about **B** is backchanneled on the second path to **S**. These retrosignals are received at **S** simultaneously, and are used by **S** to stochastically select the states of the (heterogeneous) twin particles.*The quantum substrate has a weak clairvoyance*.