The Enterprise is transporting a group of Ullians to Kaldra IV while at the same time on a mapping survey of Sector 22139.
	The Ullians have previously visited Melina II, two planets in the Nel system and Hurada III, where there have been two cases of Iresine syndrome.
	The Ullians are "telepathic historians". Not all of their species are empathic, and their powers require many years of study and development. Betazoids are unable to read them.
	Keiko's grandmother was a painter.
	Geordi got his first pet, a Circassian cat (see "Galaxy's Child") when he was 8. He thought it looked funny.
	The invasion of memories was abolished by the Ullians three centuries ago. It carries severe punishment.
	Riker mentions his ordeal on Surata IV (see "Shades of Gray").
	Riker remembers an accident in engineering in which Keller, a female engineer, was killed.
	Beverly recalls the occasion when Picard brought her to see Jack Crusher's body.
	Iresine Syndrome is a very rare neurological disorder first diagnosed in the 23rd Century, characterised by a severely decreased histamine count.

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