UCI Geocaching
This next question is pure trivia. UC Irvine opened in 1965, so how many students (Masters and Bachelors) graduated in 1966? If you know this off the top of your head, congratulations!
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If not, you can find the answer at (33.647732, -117.841231) or (+33° 38' 51.84", -117° 50' 28.43") but you have to look really hard.