* Astronomy

Grand Canyon: Free entry and free stargazing party Tuesday
 
Summer starts Tuesday with a nice freebie from the U.S. National Park Service: Visit a national park that day and pay no entrance fees. At Grand Canyon National Park in Arizona, you'll not only save the $25-per-vehicle entry fee on Tuesday--you can also attend a free stargazing party, with astronomers on hand to demystify the night sky.
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