Suggestions

1. Become "Consuming." The Yor are synthetic and shouldn't be vulnerable to having an egg planted inside them which hatches into a new Yor (or any other being).

2.  Become "Plagued." A synthetic being shouldn't be able to become organically sick.

3.  A small counter near the Spaceport Build Queue indicating the number of items in the queue.

4. A counter that indicates how many times a tech has been repeated.

5. A different symbol, maybe the Bohr Hydrogen model, indicating a Quantum Physicist.

6. A research choice within the "Available Projects" within the planetary surface screen.

7. A choice to delete ships and recover a percentage through recycling, which could be a tech (maybe even repeatable).

Thank you for a great game!