Underwater photographer Sarah Lee uses a technique known as “duck diving” to capture these stunning photos of surfers in Hawaii. Surfers “duck dive” under the water to avoid incoming waves so they can get further out to sea. Photo: A surfer comes free from her surfboard. (Photo by Sarah Lee/Caters News)

Skeleton involves a person riding a small sled down a frozen track while lying face down. The sport is a more intense form of luge because skeleton competitors leap onto the sled and slide downhill head first. Skeleton athletes can reach up to 80 mph on straightaways, causing forces up to 5g, so the helmet is a critical component for attitude as well as safety.

The National Geographic Photo Ark is a travelling exhibition of photographer Joel Sartore’s quest to create a photo archive of biodiversity around the world. So far, Sartore has captured studio portraits of more than 6,000 species – a number that he hopes to double. On 1 July, the ark will open at Melbourne zoo – the first time it has been exhibited in the southern hemisphere. More than 50 portraits will be on display, including many of Australian endangered animals being protected by programs at the zoo itself. These captions have been edited from text supplied by Melbourne zoo. Here: Barking owl. (Photo by Joel Sartore/National Geographic Photo Ark/The Guardian)

Employees work at a sorting centre of Zhongtong (ZTO) Express ahead of the Singles Day shopping festival, Chaoyang District, Beijing, November 8, 2015. On China's giant Singles Day internet shopping festival, the country's delivery firms are stretched so thin that they are looking for tie-ups, listings and new investors to husband their resources. (Photo by Jason Lee/Reuters)

Kim Joon is a Korean artist who specializes in creating images that resemble hollow porcelain human body parts painted in bold patterns from famous ceramic brands including Royal Copenhagen, Herend, and Villeroy & Boch. His latest project is called The Rocker and features a number of pictures of porcelain hands laying on a dish patterned in style of different famous rock bands of the past. The images are so vivid that it makes you think that these hands are actually real and not digitally crafted, though it would be amazing, if someone were to actually make a creation such as this in real life. (Photo by Kim Joon)

Being able to look at this world in a different light is the main thing that distinguishes a true artist from a common person. We can clearly see that Lucas Levitan is a true artist despite the crude drawings that he makes. By hunting through thousands of photos that people post on Instagram, he finds the ones that might have a completely different, surprising, and comical theme. For example, a sensual photo of lady’s eyelashes is transformed into a scene in which a farmer is harvesting his crops. This is imagination at its finest, which is why the art works of Lucas Levitan are so interesting to look at. (Photo by Lucas Levitan)

Rescue workers help the injured at the site of a multi-storey building collapse in the capital Nairobi, Kenya Sunday, January 4, 2015. The residential building in the Huruma neighborhood of Nairobi collapsed on Sunday and according to the Kenya Red Cross, a dozen people have so far been rescued but an unknown number are still feared trapped. (Photo by AP Photo)