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A grizzly bear charges through Yellowstone National Park's Lamar Valley on June 21, drawing hundreds of gawkers visiting the park on a free weekend. All national parks—including Glacier—will again waive fees on July 18-19 and August 15-16 to encourage more visitors. "During these tough economic times, our national parks provide opportunities for affordable vacations for families," Interior Secretary Ken Salazar said last week. "I encourage everyone to visit one of our nation's crown jewels this summer and especially to take advantage of the three free-admission weekends."