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Looking for a book title about a dying planet that prohibited marriage between the 3 races, they found that intermarriage produced a new race of engineers that they had been missing and could solve their problems.

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The Gods Themselves (1972) by Asimov? It was the answer to 1970s novel, planetary world with 3 gender species, prohibited inter-species procreation, a very similar question that was asked yesterday:

Prohibited inter-species procreation - eventually allowed, producing 4th gender. Two of the three genders are bureaucrats, thinkers/builders.

From Wikipedia:

The main plot-line is a project by those who inhabit a parallel universe (the para-Universe) with different physical laws from this one. By exchanging matter from their universe—para-Universe—with our universe, they seek to exploit the differences in physical laws. The exchange of matter provides an alternative source of energy to maintain their universe. However, the exchange will likely result in the collapse of the Earth's Sun into a supernova, and possibly even turning a large part of the Milky Way into a quasar. There is hope among those in the para-Universe that the energy explosion does happen in our universe.

About the three races:

The inhabitants are divided into dominant "hard ones" and subject "soft ones". The latter have three sexes with fixed roles for each sex:

  • Rationals (or "lefts") are the logical and scientific sex; identified with masculine pronouns and producing a form of sperm. They have limited ability to pass through other bodies.

  • Emotionals (or "mids") are the intuitive sex; identified with the feminine pronouns and provide the energy needed for reproduction. Emotionals can pass freely in and out of solid material, including rock.

  • Parentals (or "rights") bear and raise the offspring, and are identified with masculine pronouns. Parentals have almost no ability to blend their bodies with others, except when helped by one or both of the other sexes.

It's later described that the union of these separate groups lead to a "scientist", who could be your engineer:

Odeen convinces Dua that the hard one they will become will have influence with the others to stop the Pump; but as their final metamorphosis (the true meaning of "passing on") begins, Dua realizes (too late to prevent irreversible union) that her own triad's "hard" form is the scientist Estwald.

Estwald being the man behind the Pump, which allows transfer of matter between universes. (Though it's actually more the problem than the solution)

  • The Pump is also the solution. Scientists in our universe realize that there is an infinite number of universes, so you can play the various differences between the universes against each other. In that way, you can "trade" properties from various universes to gain energy and also neutralise the disadvantages. In the book, Estwald's universe needs energy and workd out a way to get it from our universe. Normally, this requires assistance from our universe. But, if our sun were to go nova from the "leakage" of properties then Eastwald's universe could tap that energy without us. – JRE Mar 10 at 11:24
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    @JRE Good to have a clarification from someone who's actually read it, thanks for that :) – Jenayah Mar 10 at 11:31
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    One thing that seems out of place: Mating between the left, the right and the mid isn't forbidden. It is the only way that reproduction works in Estwald's universe. All three types must "melt" together to have a child. The mid in Estwald's group is slightly weird, though, and doesn't like to melt even though it is usually the mids who are most likely to initiate a melt (sort of giggly seductresses.) A good melt produces a child. Eventually a triad remembers that they become a "hard one" during each melt, at which point they permanently become a "hard one." – JRE Mar 10 at 11:56
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    So, either both questioners are remembering that point wrong, or else they are asking about a different story. – JRE Mar 10 at 11:57
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    @JRE "The Gods Themselves" is definitely the right answer to the other question since it had a very specific detail unique to the "The Gods Themselves". This question is more generic but it's still probably the answer despite the inconsistency. – David Johnston Mar 10 at 21:40

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