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"[Science fiction] has become big business, where books are merchandised and promoted and distributed and placed on sale like slabs of bacon or cans of soup."
- Frederik Pohl

Group Ego  
  A group mind; a single entity that shares a number of bodies.  

In the travels of the New Frontiers in the novel, the colonists run across a very tidy little planet inhabited by The Little People.

One thing he did learn, and its implications opened up whole new fields of thought: the Little People had, in one sense, conquered death.

Since each of their egos was shared among many bodies, the death of one body involved no death for the ego. All memory experiences of that body remained intact, the personality associated with it was not lost, and the physical loss could be made up by letting a young native "marry" into the group. But a group ego, one of the personalities which spoke to the Earthmen, could not die, save possibly by the destruotion of every body it lived in. They simply went on, apparently forever.

Their young, up to the time of "marriage" or group assimilation, seemed to have little personality and only rudimentary or possibly instinctive mental processes. Their elders expected no more of them in the way of intelligent behavior than a human expects of a child still in the womb. There were always many such uncompleted persons attached to any ego group; they were cared for like dearly beloved pets or helpless babies, although they were often as large and as apparently mature to Earth eyes as were their elders.

Technovelgy from Methuselah's Children, by Robert Heinlein.
Published by Astounding Science-Fiction in 1941
Additional resources -

In the novel, it is also possible for people to join these groups. One of the Howard Families, Mary Sperling, does so:

Mary Sperling, moved by conviction of her own impending death, saw in the deathless group egos a way out. Faced with the eternal problem of life and death, she had escaped the problem by choosing neither . . . selflessness. She had found a group willing to receive her, she had crossed over.

The idea of a group mind can be found as early as 1930 in Olaf Stapledon's Last and First Men.

The Martians, it should be noted, had three possible forms, or formations, namely: first, an ‘open order’ of independent and very tenuous cloudlets in ‘telepathic’ communication, and often in strict unity as a group mind; second, a more concentrated and less vulnerable corporate cloud; and third, an extremely concentrated and formidable cloud-jelly.

Compare to the ring-table from The Universe Wreckers (1930) by Edmond Hamilton, a device which creates a group mind among participants. See also the entry for hive mind from Face of the Deep (1942) by Edmond Hamilton, probably the first use of that phrase.

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Additional resources:
  More Ideas and Technology from Methuselah's Children
  More Ideas and Technology by Robert Heinlein
  Tech news articles related to Methuselah's Children
  Tech news articles related to works by Robert Heinlein

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