To most, 100 years is more than a lifetime. It’s 100 birthdays. It’s 36,500 sunrises and sunsets. A grand total of 876,000 hours. In short, it’s something worth commemorating. This year, the National Park Service is celebrating its own triple-digit birthday. And for Wyoming – home of Yellowstone (the very first National Park), the Grand Tetons, 25 National Historic Landmarks and 11 nationally recognized recreation areas, trails and monuments – this centennial brings a special opportunity for reflection.