An employee of the National Park Service takes a selfie with President Barack Obama, left, in the background meeting with the crowd after a tour of Everglades National Park on Earth Day, Wednesday, April 22, 2015, in Florida. Obama used the visit to warn of the damage that climate change is already inflicting on the nation's environmental treasures. (Photo by Lynne Sladky/AP Photo)

Adolf Hitler (left), German Nazi politician, in a deck chair next to is niece Angela (Geli) Raubal – around 1930. (Photo by Ullstein Bild/Ullstein Bild via Getty Images)

Supporters react as U.S. President Donald Trump walks from Marine One to the White House in Washington, U.S., October 3, 2019. (Photo by Tom Brenner/Reuters)

Emma Raducanu of Great Britain hits a return to Belinda Bencic of Switzerland during their quarterfinals round match on the tenth day of the US Open Tennis Championships the USTA National Tennis Center in Flushing Meadows, New York, USA, 08 September 2021. The US Open runs from 30 August through 12 September. (Photo by Justin Lane/EPA/EFE)

Director George Clooney reacts as he and his wife lawyer Amal Clooney arrive for a screening of the film “The Tender Bar” as part of the BFI London Film Festival, in London, Britain, October 10, 2021. (Photo by Henry Nicholls/Reuters)

A woman holds her dog to be blessed outside St. Anton Church to mark St. Anton Day, Animal patron saint, in downtown Madrid, Spain, 17 Jan​uary 2022. (Photo by David Fernandez/EPA/EFE)

Portugal's Diana Gomes in action during the UEFA Women's Euro England 2022 group C match between Netherlands and Portugal at Leigh Sports Village on July 13, 2022 in Leigh, United Kingdom. (Photo by Carl Recine/Reuters)

“Hippo Chase”. As we approached the camp the Selinda Reserve of northern Botswana our boat passed by a hippo resting in the water. I turned around to look back at the boat's wake and saw the hippo charging after us! The hippo must've been tired from an all-nighter because he was angry. He rose way up out of the water three times trying to chase our boat! He was coming at us with such force that he created a wake of his own. Photo location: Selinda Reserve of northern Botswana. (Photo and caption by Curtis Simmons/National Geographic Photo Contest)