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Originally Posted by Chris Lefkow
US President Richard Nixon gave moon rocks collected by Apollo 11 and Apollo 17 astronauts to 135 countries around the world and the 50 US states as a token of American goodwill.
While some hold pride of place in museums and scientific institutions, many others are unaccounted for—they have either gone missing, were stolen or even destroyed over the decades.
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Chris Lefkow provides an account of what happened to some of them :-
https://phys.org/news/2019-06-apollo-goodwill-moon.html
Meanwhile, with new scientific techniques, the rocks that are available today for study are continuing to reveal more information about the early solar system :-
https://phys.org/news/2019-06-ion-at...rets-moon.html