Three workers demonstrating the different types of gas masks used in mine rescue work. (Photo by Fox Photos/Getty Images). December 1925

Dr. Lisa Ballance (NOAA Fisheries Service) with a curious calf – this is a Type C killer whale, a fish-eater.

Supporters of Pakistan Tehreek-e-Insaf (PTI) party of Prime Minister Imran Khan shout slogans outside the Parliament House building in Islamabad on April 3, 2022. Pakistan will go to the polls to elect a new government within three months after Prime Minister Imran Khan foiled an attempt to boot him from office April 3 by getting the president to dissolve the national assembly. (Photo by Aamir Qureshi/AFP Photo)

Isaiah Bowen, right, takes a shot as his dad, Garth Bowen, center, looks on at a basketball hoop in front of the statue of Confederate General Robert E. Lee on Monument Avenue Sunday June 21, 2020, in Richmond, Va. A judge extended an injunction delaying the removal of the statue by the state. The statue had become a focal point for the Black Lives Matter movement in Richmond. (Photo by Steve Helber/AP Photo)

Khansa, an eight month old critically endangered Bornean orangutan shows off it's two front-teeth, at the Singapore Zoo on Thursday, January 11, 2018 in Singapore. The Singapore Zoo is active with its breeding programs as part of its wildlife preservation efforts. This is the Zoo's 46th successful orangutan birth. (Photo by Wong Maye-E/AP Photo)

In this handout photo provided by the Helmholtz Center for Research on Infectious Diseases an EHEC bacteria is visible on May 30, 2011 in Berlin, Germany. German health authorities have attributed at least 14 deaths within the last two weeks to an outbreak of enterohemorrhagic E. coli, also known as the EHEC bacteria. (Photo Courtesay Manfred Rohde, Helmholtz-Zentrum fuer Infektionsforschung (HZI)/Getty Images)

This undated photo provided by NOAA in May 2018 shows aurora australis near the South Pole Atmospheric Research Observatory in Antarctica. When a hole in the ozone formed over Antarctica, countries around the world in 1987 agreed to phase out several types of ozone-depleting chemicals called chlorofluorocarbons (CFCs). Production was banned, emissions fell and the hole shriveled. But according to a study released on Wednesday, May 16, 2018, scientists say since 2013, there’s more of a banned CFC going into the atmosphere. (Photo by Patrick Cullis/NOAA via AP Photo)