This was published after he died: his sort of unfinished notes on self-reproducing machines, what it takes to get the machines sort of jump-started to where they begin to reproduce.
See publitseeriti pärast tema surma: tema niiöelda lõpetamata kirjutised isepaljunevatest masinatest. Mida on vaja, et masinad jõuaksid punkti, kus nad hakkaksid paljunema.