There is a node21:

	{
		id = "node21",
		text = _"(Calmly accept this information)",
		echo_text = false,
		topic = "Linarians Attacked",
		code = function()
			Tux:says(_"What happened to the other Linarians that survived first contact?")
			Npc:says(_"Sadly, I do not know. All that remains are legends. For a time,
Linarians wandered the planet performing grand deeds and earning the respect of
most of humanity.")
			Npc:says(_"But as time passed, so did the memories of the great deeds. It is
unlikely that you will find many who know more about your people's noble past.")
			Npc:says(_"Perhaps there are still other Linarians alive here on our planet.
Or maybe some went back to your own planet.")
			Chandra_first_contact = true
			hide("node20")
			pop_topic()
		end,
	},


which is shown in node20 and hidden in node22.

I'll close this as invalid.