Anechoic chamber, Copenhagen, Denmark (© Alastair Philip Wiper/Science Photo Library)(Bing Australia)

The Northern Beaches in Sydney, New South Wales, Australia (© Ian Bird/Rex Features)(Bing Australia)

Young chacma baboon in Moremi Game Reserve, Okavango Delta, Botswana (© Chris Schmid/Aurora Photos/Offset)(Bing Australia)

Giant mural in Pachuca, Hidalgo state, Mexico (© Omar Torres/Getty Images)(Bing Australia)

A Cape white-eye perched (© Rob Hofmeyr/Mammoth HD)(Bing Australia)

Flinders Street Station in Melbourne, Victoria, Australia (© Ashley Cooper/Aurora)(Bing Australia)

Galápagos sea lion and pup, Rábida Island, Galápagos Islands, Ecuador (© Pete Oxford/Minden Pictures)(Bing Australia)

Xinyuan County, China (© Danny Hu/Getty Images)(Bing Australia)

Wreckage of the SS Thistlegorm in the Red Sea (© Alex Mustard/Minden Pictures)(Bing Australia)

Dolwyddelan Castle in Wales (© Jim Richardson/National Geographic Creative/Alamy)(Bing Australia)

Lavender blooming in northern Thailand (© Tanat Loungtip/Alamy)(Bing Australia)

Man fishes in the Ord River at Kununurra, Western Australia (© Andrew McInnes/Alamy)(Bing Australia)

Milky Way above Mount Rainier in Mount Rainier National Park, Washington (© Brad Goldpaint/Aurora Photos)(Bing Australia)

Fox kits playing in the Rocky Mountain foothills near Cascade, Montana (© Jason Savage/Tandem Stills + Motion)(Bing Australia)

Coloured scanning electron micrograph of a seven-spot ladybird in flight (© Power and Syred/Science Photo Library)(Bing Australia)

The Biosphere museum in Montreal, Canada (© Guenther Schwermer/REX/Shutterstock)(Bing Australia)

Installation by artist Paul de Kort in De Biesbosch National Park, Netherlands (© Frans Lemmens/Alamy)(Bing Australia)

Saffrondrop bonnet mushrooms in Meerdaal, Belgium (© Danny Lap/Minden Pictures)(Bing Australia)

Kanas National Nature Reserve in Xinjiang Province, China (© zhouyousifang/Getty Images)(Bing Australia)

Burano, in the Venetian Lagoon, Italy (© Digitaler Lumpensammler/Getty Images)(Bing Australia)

A green sea turtle shows off its shell (© Sergi Garcia Fernandez/Minden Pictures)(Bing Australia)

An elevated walkway in the Lujiazui district of Shanghai, China (© Mark Harris/Getty Images)(Bing Australia)

Lake Siskiyou reflects snowy Mount Shasta in northern California (© Walter Bibikow/Danita Delimont/Alamy)(Bing Australia)

Common kestrel hunting for rodents (© Bertie Gregory/Corbis)(Bing Australia)

Uluru in Uluru–Kata Tjuta National Park, Australia (© Lachlan Fennen/500px)(Bing Australia)

Autumn aspens in Grand Teton National Park, Wyoming (© Matt Anderson Photography/Getty Images)(Bing Australia)

Dyed silk hanging to dry in Marrakech, Morocco (© David Noton Photography/Alamy)(Bing Australia)

Marshall Point Lighthouse near Port Clyde, Maine (© Stephen Ippolito/REX)(Bing Australia)

To Sua Ocean Trench in Lotofaga, Upolu, Samoa (© Danita Delimont/Offset)(Bing Australia)

Salzach River in Austria (© T Schäffer/age fotostock)(Bing Australia)