A sphere that stores liquid hydrogen is explained by plant engineer Hannah Nelson during a tour as Air Liquide opens its North Las Vegas Hydrogen Production facility, supplying California's mobility market, in Las Vegas, Nevada, U.S., May 24, 2022. REUTERS/Bridget Bennett 

Reinhard Fuchs of REWAG explains how the biomass power plant works using a diagram inside the plant in Viehhausen near Regensburg, Germany, May 23, 2022. Picture taken May 23, 2022. REUTERS/Lukas Barth 

An employee explains how the biomass power plant works using a display inside the plant in Viehhausen near Regensburg, Germany, May 23, 2022. Picture taken May 23, 2022. REUTERS/Lukas Barth 

An employee explains how the biomass power plant works using a diagram inside the plant in Viehhausen near Regensburg, Germany, May 23, 2022. Picture taken May 23, 2022. REUTERS/Lukas Barth 

CEO RJ Scaringe explains how the startup Rivian Automotive's electric vehicle factory works in Normal, Illinois, U.S. April 11, 2022. Picture taken April 11, 2022. REUTERS/Kamil Krzaczynski 

Timotheus Hoettges, CEO of German telecommunications giant Deutsche Telekom AG, holds a piece of a GSM antenna being used in tunnels of the German railways Deutsche Bahn as he explains the Telekom's efforts to improve mobile internet in Germany's high-speed trains ICE, during the general shareholders meeting, the first in-person assembly in two years amid the coronavirus disease (COVID-19) pandemic, in Bonn, Germany, April 7, 2022. REUTERS/Wolfgang Rattay 

Traditional African Kente Cloth covers a newly installed plaque, explaining the links to the street name and the slave trade is seen outside the World Museum in Liverpool, Britain, April 5, 2022. REUTERS/Phil Noble 

A newly unveiled plaque, explaining the links to the street name and the slave trade is seen outside the World Museum in Liverpool, Britain, April 5, 2022. REUTERS/Phil Noble 

A newly unveiled plaque, explaining the links to the street name and the slave trade is seen outside the World Museum in Liverpool, Britain, April 5, 2022. REUTERS/Phil Noble 

Desi Banatao, CEO of Wave Computing, explains the company's chip design technology, in Menlo Park, California, U.S., March 31, 2022. Picture taken March 31, 2022. REUTERS/JANE LANHEE LEE 

A shooting instructor explains how to aim a weapon, during practice session at a shooting range in Warsaw, Poland March 23, 2022. Picture taken March 23, 2022. REUTERS/Kuba Stezycki 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer The Boeing plane that crashed in China on March 21 took a plunge from cruising altitude 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer A Boeing 737-800 aircraft with 132 people on board crashed in China on March 21, 2022. 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer Altitude chart of the Boeing 737-800 aircraft that crashed in China on March 21 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer 1,353 people have died in aircraft crashes in China in the last 40 years 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer The flight data recorder and cockpit voice recorder shed light on the crash's cause 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer Altitude chart of the Boeing 737-800 aircraft that crashed in China on March 21 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer A Boeing 737-800 aircraft with 132 people on board crashed in China on March 21, 2022. 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer The plane that crashed on March 21, had flown over a 1,000 flights over the last year. 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer The flight data recorder and cockpit voice recorder shed light on the crash's cause 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer 1,353 people have died in aircraft crashes in China in the last 40 years 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer The Boeing plane that crashed in China on March 21 took a plunge from cruising altitude 

Graphics showing the flight path, altitude and service history of the flight, and aircraft accidents in China, accidents by stage of flight and a black boxes explainer The plane that crashed on March 21, had flown over a 1,000 flights over the last year. 

Bear sanctuary director Ihor Nykolun explains the rescue mission of the bears Aska and Popeye from the Kyiv zoo, during an interview with Reuters at the sanctuary on the outskirts of Lviv, Ukraine, March 8, 2022. REUTERS/Kai Pfaffenbach 

A salesman explains to visitors about its military defense systems at Ukrainian stand displaying the latest defense system at World Defense Show in Riyadh, Saudi Arabia, March 6, 2022. REUTERS/Ahmed Yosri 

A pro-Saied volunteer explains to a citizen about an online multiple-choice questionnaire that President Kais Saied has set up as a part of a 'consultation' before he rewrites the constitution, in Tunis, Tunisia February 28, 2022. Picture taken February 28, 2022. REUTERS/Jihed Abidellaoui 

An aid worker explains to people who have fled Ukraine because of the Russian invasion that a bus will transport them to a nearby refugee center, in Medyka, Poland, February 28, 2022. REUTERS/Bryan Woolston 

An aid worker explains to people who have fled Ukraine because of the Russian invasion that a bus will transport them to a nearby refugee center, in Medyka, Poland, February 28, 2022. REUTERS/Bryan Woolston 

A member of the Ukrainian Territorial Defence Forces explains a volunteer how to care a Kalashnikov assault rifle, after Russia launched a massive military operation against Ukraine, inside a cafe in the city of Zhytomyr, Ukraine February 27, 2022. REUTERS/Viacheslav Ratynskyi 

Franco Cagnoli, 39, caretaker of the Rocca Calascio castle explains to tourists the history of the castle situated at 1410 metres above sea level, as the sun rises in the small village of Rocca Calascio, Italy, February 25, 2022. Italy counts about 1000 villages abandoned since the 1950 but in recent years the trend has been reversed with young people trying to revive them. Picture taken February 25, 2022. REUTERS/Remo Casilli 

Diagrams showing the sequence in a figure skating quadruple jump. 

A worker explains a new earthquake early warning system which triggers sirens if a nationwide network of 120 seismic monitoring stations detects a strong earthquake during a demonstration at the Geological Survey of Israel in Jerusalem February 7, 2022. REUTERS/Amir Cohen 

A worker explains a new earthquake early warning system which triggers sirens if a nationwide network of 120 seismic monitoring stations detects a strong earthquake during a demonstration at the Geological Survey of Israel in Jerusalem February 7, 2022. REUTERS/Amir Cohen 

An interactive chart of top Olympic medal winners by country 

Chart of daily COVID-19 cases at the Beijing 2022 Winter Olympics. 

Les Ansley, owner of Indlovu Gin, uses a copper pot distilling kit to explain how Indlovu gin is infused with elephant-foraged botanicals, in Paarl, near Cape Town, South Africa, January 28, 2022. Picture taken January 28, 2022. REUTERS/Sumaya Hisham 

Beijing 2022 — 雪を「降らせる」 

Beijing 2022 — Canon à neige 

Beijing 2022 — Hágase la nieve 

3D illustration of a snow gun showing how artificial snow is made. 

Beijing 2022 — 北京五輪の「バブル方式」 

Beijing 2022 — La bulle olympique de Pékin 

Beijing 2022 — La burbuja de los Juegos de Pekín 

Flow chart showing how Beijing’s closed-loop system will work. 

Explaining the size and scale of the Hunga Tonga underwater volcanic eruption 

Veterinarian Walid Tandira explains an X-ray image to a horse owner at Al Rawasy Veterinary Clinic in Benghazi, Libya January 20, 2022. Picture taken January 20, 2022 REUTERS/Esam Omran Al-Fetori 

Julie Langan, director of the Virginia Department of Historic Resources, explains the process of handling what is believed to be a time capsule, found in Confederate General Robert E. Lee's monument, which was buried in 1887, in Richmond, Virginia, U.S., December 22, 2021. REUTERS/Jay Paul 

An interactive look at the history, mechanics, equipment and schedules for the Cross Country Skiing events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Ice Hockey events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Skeleton events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Freestyle Skiing events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Biathlon events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Bobsleigh events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Curling events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Snowboard events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Nordic Combined events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Short Track Speed Skating events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Speed skating events at the Winter Olympics 

An interactive look at the history, mechanics, equipment and schedules for the Alpine Skiing events at the Winter Olympics 

An interactive chart of top Olympic medal winners by country