The "special items" that each astronaut was allowed to carry was called a "Personal Preference Kit" in the jargon of NASA. Every item had to be approved by NASA to make sure the total weight was within limits and also it wouldn't outgas any solvents or be flammable in a pure oxygen atmosphere or pose any sort of danger to the mission. According to this thread on Neil Armstrong's Apollo personal preference kits, he never really enumerated the items - when asked to for a biography, he said he couldn't find a manifest. However, at that time he recalled
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Some Apollo 11 medallions,Gold olive branch jewelry for his wife and mothera piece of wood and fabric from the Wright Flyera college fraternity pin</span>
And then at other times it has come out that he also carried:
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A pennant from an Argentine soccer team (? I don't know if that's ever been explained why)A scout badge<span>
A 20 Franc coin and necklace</span></span>
I inferred you are referring to the article found here https://kids.nationalgeographic.com/explore/science/green-invaders/
<u>Explanation:</u>
The tiny invaders being discussed in this article are <u>plants.</u> These plants are considered are invaders because they come from other countries, but are now threatening the existence of the country's native plants. They were brought in by people because they wanted to make their gardens and yards look beautiful since they rarely found locally.
Rosenhan himself and other eight pseudo patients who were mentally healthy claimed that they had auditory illusions and they were admitted in the hospital.
They were diagnosed that they were the patients of schizophrenia and they were debased. They were also diagnosed that they had manic depressive lunacy and they needed to be in a mental asylum. After the diagnosis, they claimed that they were fine and they desired to go out of the hospital.
The impact of this diagnosis is that Rosenhan condemned the dependability of the psychiatric analysis. He uncovered the truth in the experiment rather than the methodology of the experiment.