05-12A view across the River Shannon in Limerick, County Limerick, Ireland - Piotr Machowczyk/Shutterstock)
05-10The Hōkūle'a, a traditional Hawaiian voyaging canoe, departs for a 3-year voyage from Honolulu, Hawaii, on May 17, 2014 - Reuters/Alamy)
05-07Norcross Brook and wetlands near Moosehead Lake in Piscataquis County, Maine - Aaron Black-Schmidt/Tandem Stills + Motion)
05-04Grey seal hitching itself over the beach at Donna Nook, North Lincolnshire, England - Frederic Desmette
05-03Poster for Teacher Appreciation Week by 12-year-old Caroline Holt, 7th-grade student at the Bush School, Seattle, Washington - Caroline Holt/Eugenia Chang)