AP
FILE - In this Dec. 1, 2017 file photo, Britain's Prince Harry and his fiancee Meghan Markle arrive at Nottingham Academy in Nottingham, England. It wasn't all doom and gloom in 2017. The year was also filled with awe-inspiring moments that united us and warmed the heart. From a simple proposal over roast chicken to plans for a royal wedding, news that the rugged Prince Harry is engaged to American actress Meghan Markle has many cheering. (AP Photo/Frank Augstein, File)
- Frank Augstein
FILE - In this Nov. 7, 2017 file photo Fiona, a Nile hippopotamus plays in her enclosure at the Cincinnati Zoo & Botanical Garden, in Cincinnati. Born six weeks prematurely at 29 pounds, well below the common 50-100 pound range, and required nonstop critical care by zookeepers to ensure her survival. While negative news dominated headlines in 2017, the year was also filled with awe-inspiring moments that united us and warmed the heart. Fiona became a story of survival as she overcame the odds. (AP Photo/John Minchillo File)
- John Minchillo
FILE - In this Aug. 21, 2017 multiple exposure photograph, the phases of a partial solar eclipse are seen over the Gateway Arch in St. Louis. It wasn't all doom and gloom in 2017. The year was also filled with awe-inspiring moments that united us and warmed the heart. The first total solar eclipse to cross the U.S. in a generation bought millions together in what some could only describe as a primal experience.(AP Photo/Jeff Roberson File)
- Jeff Roberson
FILE - In this Sept. 18, 2017 file photo, 35 immigrants from 23 countries recited the Oath of Allegiance, during the naturalization ceremony in Jackson, Miss. It wasn't all doom and gloom in 2017. The year was also filled with awe-inspiring moments that united us and warmed the heart. According to the U.S. Citizenship and Immigration Services, 603,825 people became naturalized U.S. citizens in the first nine months of 2017. The ceremonies can be huge moments for those involved. (AP Photo/Rogelio V. Solis File)
- Rogelio V. Solis
FILE - In this Aug. 21, 2017 file photo, the moon almost eclipses the sun during a near total solar eclipse as seen from Salem, Ore. An economic analysis of last summer's total eclipse found that nearly 192,000 people traveled to Wyoming to view the event. In addition, the study released Monday, Dec. 11 by the state Office of Tourism estimated that the celestial event boosted the state's economy by an estimated $63.5 million. (AP Photo/Don Ryan, file)
- Don Ryan
FILE - In this Dec. 1, 2017 file photo, Britain's Prince Harry and his fiancee Meghan Markle arrive at Nottingham Academy in Nottingham, England. Prince Harry's fiancee is set to join Britain's royal family for Christmas. Kensington Palace says Meghan Markle will join Queen Elizabeth II and other senior royals at Sandringham, a sprawling estate in Norfolk, 110 miles (175 kilometers) north of London, it was announced on Wednesday, Dec. 13, 2017. (AP Photo/Frank Augstein, File)
- Frank Augstein
FILE - In this Aug. 21, 2017 file photo, Jack Kvenild, 5, of Laramie, Wyo., watches the eclipse onset at Glendo Reservoir in near Glendo in east-central Wyoming. An economic analysis of last summer's total eclipse found that nearly 192,000 people traveled to Wyoming to view the event. In addition, the study released Monday, Dec. 11 by the state Office of Tourism estimated that the celestial event boosted the state's economy by an estimated $63.5 million. (AP Photo/Mead Gruver, file)
- Mead Gruver