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Exterior of the Francis Crick Institute, one of the largest medical research centres in Europe, Kings Cross, London, England, United Kingdom, Europe

The Francis Crick Institute biomedical research centre, with St. Pancras railway station in the background, King's Cross, London, England, United Kingdom, Europe

A lab technician working in a laboratory in a small hospital in Nepal holds a rack of test tubes, Jiri, Solu Khumbu, Nepal, Asia

A young lab technician in a hospital in Nepal holds a rack of test tubes, Diktel, Khotang District, Nepal, Asia

A lab technician working in a laboratory in a small hospital in Nepal holds a rack of test tubes, Jiri, Solu Khumbu, Nepal, Asia

A lab technician working in a laboratory in a small hospital in Nepal looks into a microscope, Jiri, Solu Khumbu, Nepal, Asia

Adult black-browed albatross (Thalassarche melanophrys), in flight returning to nesting site on West Point Island, Falklands, South America

Views of the Trinity Church at Belingshausen Russian Research Station, Antarctica, Southern Ocean, Polar Regions

Antarctic tern (Sterna vittata), feeding in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Theological Faculty, Stellenbosch University, Stellenbosch, Western Cape Province, South Africa, Africa

Views of the wreck of the Guvernoren, a 20th century whale processing ship, in the Enterprise Islands, Antarctica, Polar Regions

The Mafra Palace Library, one of Europe's most important libraries, located in Mafra National Palace, UNESCO World Heritage Site, Lisbon region, Portugal, Europe

Southern elephant seals (Mirounga leonina), hauled out for their annual catastrophic molt (moult) on the beach at Snow Island, Antarctica, Polar Regions

Southern elephant seals (Mirounga leonina), hauled out for their annual catastrophic molt (moult) on the beach at Snow Island, Antarctica, Polar Regions

Moesgaard Museum (MOMU), Henning Larsen Architect, museum of archaeology and ethnography, Hojbjerg, a suburb of Aarhus, Jutland Peninsula, Denmark, Europe

Wild Galapagos giant tortoise (Geochelone elephantopus) at Urbina Bay, Isabela Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult gentoo penguin (Pygoscelis papua), porpoising for swimming speed near the Antarctic Peninsula, Southern Ocean, Polar Regions

Guest from the Lindblad Expedition ship National Geographic Explorer holding up a block of ice in the Svalbard Archipelago, Norway, Arctic, Europe

CT Ticknor, staff member from the Lindblad Expedition ship National Geographic Explorer using binoculars in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expedition ship National Geographic Explorer at Austfonna in the Svalbard Archipelago, Norway, Arctic, Europe

Ice crystals, Science Center, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Aerial of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Wandjina art form of various animals on King Leopold Sandstone, Swift Bay, Kimberley, Western Australia, Australia, Pacific

Science and Technology Gallery, National Museum of Scotland, Edinburgh, Scotland, United Kingdom, Europe

An adult bull introduced reindeer (Rangifer tarandus) before eradication in Stromness Bay, South Georgia, Polar Regions

First year Adelie penguin (Pygoscelis adeliae) chicks at breeding colony at Brown Bluff, Antarctica, Polar Regions

Library at Monasterio y Museo de la Recoleta, UNESCO World Heritage Site, Arequipa, Arequipa Province, Arequipa Region, Peru, South America

Moon jellyfish (Aurelia aurita), Aquarium of San Sebastian, Bay of Biscay, province of Gipuzkoa, Basque Country, Spain, Europe

Views of the Chilean Antarctic refuge hut Jorge Bonnen Rivera situated on Hut Point on the Antarctic Peninsula, Antarctica, Polar Regions

Views of the Chilean Antarctic refuge hut Jorge Bonnen Rivera situated on Hut Point on the Antarctic Peninsula, Antarctica, Polar Regions

The National Library of Malta in Valletta, also known as the Bibliotheca. Built in Republic Square in 1786, it contains a research and reference library and the archive of the Order of St John.

Bacteria bomb made of ceramic used by the Japanese Imperial army Unit 731 during WWII, Quzhou City, Zhejiang Province, China

Yellow-crowned Night Heron (Nyctanassa violacea), Sanibel Island, J.N. Ding Darling National Wildlife Refuge, Florida, USA

Museum of Oaxacan Cultures, interior, Convent of Santo Domingo de Guzman, Oaxaca de Juarez, Oaxaca State, Mexico

Aerial drone view of particular ice textures formed in the Hoffelsjokull glacier following global warming, Iceland, Polar Regions

The Mafra Palace Library, one of Europe's most important libraries, located in Mafra National Palace, UNESCO World Heritage Site, Lisbon region, Portugal, Europe

Neolithic archaeological site of Karahan Tepe, circular stone structure with T Shape pillars, Sanliurfa, Turkey, Asia Minor, Asia

Neolithic archaeological site of Karahan Tepe, circular stone structure with T Shape pillars, Sanliurfa, Turkey, Asia Minor, Asia

View over Main Plaza towards Great Acropolis and Temple of Five Floors, Edzna Archaeological Site, Campeche State, Mexico

Rana El Zein, Deputy Director at AFALULA, and White saxaul (Haloxylon persicum), Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Rana El Zein, Deputy Director at AFALULA, and White saxaul (Haloxylon persicum), Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Rana El Zein, Deputy Director at AFALULA, and White saxaul (Haloxylon persicum), Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

Woman photographing Palm plantation colonized by invasive Sodom apple (Calotropis procera), Sharaan Nature Reserve, Medina Province, Saudi Arabia