![History [of extraterrestrial life]](/nks/img/thumbnails/notes-12-10--history-of-extraterrestrial-life--textonly.png "History [of extraterrestrial life]")
![[Ideas of] meaning in programs](/nks/img/thumbnails/notes-12-10--ideas-of-meaning-in-programs--textonly.png "[Ideas of] meaning in programs")
![Forms of [engineered] artifacts](/nks/img/thumbnails/notes-12-10--forms-of-engineered-artifacts--textonly.png "Forms of [engineered] artifacts")
![[Meaning in] molecular biology](/nks/img/thumbnails/notes-12-10--meaning-in-molecular-biology--textonly.png "[Meaning in] molecular biology")
![Possible purposes [for systems]](/nks/img/thumbnails/notes-12-10--possible-purposes-for-systems--textonly.png "Possible purposes [for systems]")
![Doubling rules [cellular automata]](/nks/img/thumbnails/notes-12-10--doubling-rules-cellular-automata--textonly.png "Doubling rules [cellular automata]")
![Searching [for doubling rules]](/nks/img/thumbnails/notes-12-10--searching-for-doubling-rules--textonly.png "Searching [for doubling rules]")
![Properties [of doubling rules]](/nks/img/thumbnails/notes-12-10--properties-of-doubling-rules--textonly.png "Properties [of doubling rules]")
![[Rules implementing] other functions](/nks/img/thumbnails/notes-12-10--rules-implementing-other-functions--textonly.png "[Rules implementing] other functions")
![Other examples [of minimal systems]](/nks/img/thumbnails/notes-12-10--other-examples-of-minimal-systems--textonly.png "Other examples [of minimal systems]")
![[History of] SETI](/nks/img/thumbnails/notes-12-10--history-of-seti--textonly.png "[History of] SETI")
![Detection methods [for SETI]](/nks/img/thumbnails/notes-12-10--detection-methods-for-seti--textonly.png "Detection methods [for SETI]")
![Messages to send [to extraterrestrials]](/nks/img/thumbnails/notes-12-10--messages-to-send-to-extraterrestrials--textonly.png "Messages to send [to extraterrestrials]")
![P versus NP [and messages]](/nks/img/thumbnails/notes-12-10--p-versus-np-and-messages--textonly.png "P versus NP [and messages]")
![Science fiction [and extraterrestrials]](/nks/img/thumbnails/notes-12-10--science-fiction-and-extraterrestrials--textonly.png "Science fiction [and extraterrestrials]")
![Practical arguments [about exterrestrials]](/nks/img/thumbnails/notes-12-10--practical-arguments-about-exterrestrials--textonly.png "Practical arguments [about exterrestrials]")
History [of extraterrestrial life]
[Ideas of] meaning in programs
Forms of [engineered] artifacts
[Meaning in] molecular biology
Possible purposes [for systems]
Doubling rules [cellular automata]
Searching [for doubling rules]
Properties [of doubling rules]
[Rules implementing] other functions
Minimal cellular automata for sequences
Other examples [of minimal systems]
Higher perception and analysis
Messages to send [to extraterrestrials]
Science fiction [and extraterrestrials]