Seized plastic handguns which were created using 3D printing technology are displayed at Kanagawa police station in Yokohama, south of Tokyo, in this photo taken by Kyodo May 8, 2014. Yoshimoto Imura became the first man to be arrested in Japan for illegal possession of two guns he created himself using 3D printing technology, Japanese media said on Thursday. The 27-year-old, a college employee in the city of Kawasaki, was arrested after police found video online posted by Imura claiming to have produced his own guns. Gun possession is strictly regulated in Japan. Police raided Imura's home and found five guns, two of which could fire real bullets, Japanese media said. (Photo by Reuters/Kyodo)

The rotating updraft base of a supercell thunderstorm, and a rear flank downdraft containing rain and hail, backlit by the setting sun, on May 10, 2014, in Climax, Kansas, United States. To most of us, dark clouds on the horizon usually means rain – but here in Kansas, they can also signal the start of a supercell. The huge formations, also known as rotating thunderstorms, are among the most powerful weather phenomenon found over land. They can occur anywhere where the conditions are right, but are normally found in more arid climates. These awe-inspiring supercells were captured south of Climax city by storm chaser Stephen Locke. (Photo by Stephen Locke/Barcroft Media)

Growing cities, overuse of fertilizers and factory wastewater have degraded China's water supplies to the extent that half the nation's rivers and lakes are severely polluted. China aims to spend $850 billion to improve filthy water supplies over the next decade, but even such huge outlays may do little to reverse damage caused by decades of pollution and overuse in Beijing's push for rapid economic growth. Photo: Fishermen row a boat in the algae-filled Chaohu Lake in Hefei, Anhui province, June 19, 2009. (Photo by Jianan Yu/Reuters)

Figure skating couple Madison Chock and Evan Bates, of the USA, practice their dance routine during a training session at the 2022 Winter Olympics, Thursday, February 3, 2022, in Beijing. (Photo by Natacha Pisarenko/AP Photo)

A woman walks past as South Korean soldiers participate in an anti-chemical and anti-terror exercise as part of the 2023 Ulchi Freedom Shield (UFS) at subway station on August 22, 2023 in Seoul, South Korea. The 11-day exercise, which features drills including the handling of chemical and biological attacks, is a regular joint exercise between U.S. and South Korean troops. (Photo by Chung Sung-Jun/Getty Images)

Afghan women attend a rally to support Afghan security forces and demand peace in the country in Herat, Afghanistan, 08 February 2021. Hamdullah Mohib, Afghanistan's National Security Advisor told a press conference in Kabul on 06 February, the Afghan government was ready for war after successive setbacks in recent weeks to peace talks with the Taliban, who have refused to return to discussions that began in September in Doha. (Photo by Jalil Rezayee/EPA/EFE)

Winner. “This was taken in the South Ari Atolls, Maldives, as the south-west monsoon season was setting in. It features my partner – and dive buddy – Emma after surfacing at the end of the last dive of the day to find 1.5 metre swells and dark monsoon clouds. MICK RYAN, JUDGE: This beautiful portrait of a diver in an ocean swell below a menacing sky stands out this month for its emotional and elemental beauty. It is a reminder that while we may play among nature we are always dwarfed by its power and must be constantly on our guard”. (Photo by Simon Dunn/The Guardian)