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Highlights from your own Wikipedia article:
33 of 36 of the Apollo astronauts who were on the nine Apollo missions to leave Earth orbit have early stage cataracts that have been shown to be caused by radiation exposure to cosmic rays during their trip.
An example of such an exchange is the evidence for the landing of the Apollo 11, Apollo 14, and Apollo 15 retroreflectors on the Moon.[19] Scientists have reflected lasers off these to measure the distance between Earth and the Moon (see Lunar Laser Ranging Experiment).
The extensive payload of Moon rocks brought back from the Moon are still analyzed by scientists to this day as some of the only samples returned from another body in the solar system. While it is true that rocks dislodged from the Moon by meteoric impacts occasionally land on Earth, and a handful of rocks believed to be from the Moon and Mars have been found in Antarctica and other places, there are only a few of these objects in our collections and the rest of the rocks collected on Earth are entirely different in composition and in their detailed structures from those found and returned from the Moon. Scientists currently identify thirty-nine lunar meteorites — orders of magnitude fewer than the number of rocks brought back from lunar missions
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