I can answer this question. A employee at NASA stole some rocks to have sex on them with his Girlfriend. NASA has 17,767 employee's and only so many rocks.
http://www.livescience.com/33409-6-q...x-on-moon.html
Part of the American legacy and if you stretch it Western legacy since a few European scientists were working for,with NASA, not Russian legacy. Get your own rocks.artifacts are part of the legacy of humanity