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As you can see, there is a lot that physicists know, and don't know, about what surrounds us, from the tiniest grain of sand to the stars and everything in between. We hope you enjoyed this tour of particle physics, and that you understand a bit more about surrounds you, too.

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You can always visit our home page, at

<http://pdg.lbl.gov/cpep/adventure.html>

which contains an expanded version of what you've seen here,
with more explanations and graphics, as well as academic resources
for the classroom.