Luis Hernan was always curious about how wireless technologies like radio are transmitted through the air. So after finishing up his studies in architecture, computer science, and design, Hernan decided to research these invisible signals through a PhD at Newcastle University. Hernan set up a system that turned the wireless signals around him into colourful, ghostlike images using long-exposure photography, allowing people to see the strength of the signals around them. (Photo by Luis Hernan)

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A couple takes a photo outside the MUJA (Jurassic Museum of Asturias) in Colunga, northern Spain, November 6, 2015. The scientific team of the Jurassic Museum of Asturias (MUJA) presents their latest studies on the fossil of a Ichthyosaur, which acccording to them is the most complete found in the Iberian Peninsula and one of the few in the world. (Photo by Eloy Alonso/Reuters)

Boats of fishermen are seen on the dried Poopo lakebed in the Oruro Department, south of La Paz, Bolivia, December 17, 2015. Lake Poopo in Bolivia, the Andean nation's formerly second largest after the famed Titicaca, has dried up entirely. With the water now gone, animals have died off in the millions, according to studies. And the local families, having lost much of their sustenance, have been forced to migrate. (Photo by David Mercado/Reuters)

The combination of Venezuela's sky-rocketing prices and chronic product shortages have left many struggling to put regular food on their tables and maintain a balanced diet. According to one recent study, 87 percent of Venezuelans say their income is now insufficient to purchase their food needs. Here: All the food available in the house of Antonia Torres and her family, is pictured at their home in Caracas, Venezuela April 22, 2016. (Photo by Carlos Garcia Rawlins/Reuters)

The incredible detail in each photo is thanks to Jordi Benitez Castells, years of experience taking photos while diving. Jordi, 40, from El Vendrell, Spain, was in Catalunya when he took the photos and managed to get the snaps at about three metres below the surface in most cases. While he works full-time in a bank, Jordi dons his wetsuit out of hours to go diving and uses a Canon 7D to get his shots. Here: One of the beautiful jellyfish. (Photo by Jordi Benitez/Caters News)

In this Thursday, February 14, 2019, photo, a Transformer's Bumblebee mascot helps a woman carries paper bags at a shopping mall in Handan in north China's Hebei province. U.S. and Chinese envoys are holding a second day of trade talks after the top economic adviser to President Donald Trump said he has yet to decide whether to go ahead with a March 2 tariff increase on imports from China. (Photo by Chinatopix via AP Photo)