Emily Funk, an associate specialist at the University of California Davis, waits for a fluorescent reader to finish running a SHERLOCK test that will determine the exact species of a Chinook salmon while on a research vessel on the San Joaquin River off Antioch, California, U.S., May 25, 2021. Picture taken May 25, 2021. REUTERS/Nathan Frandin 

Scorpions are seen glowing in a fluorescent hue, coming from a substance naturally contained in their exoskeleton, as Mohamed Hamdy shines an ultra violet light onto them, in a box at his company Cairo Venom Company, a project housing thousands scorpions in various farms across the country, in Cairo, Egypt December 6, 2020. Picture taken December 6, 2020. REUTERS/Mohamed Abd El Ghany 

Poll workers Mary Dauden and Van Paterson help a voter wearing camouflage and a fluorescent work jacket at the Milwaukee Public Library?s Good Hope branch, on the first day of in-person voting in Wisconsin, U.S., October 20, 2020. REUTERS/Bing Guan 

A person holds a fluorescent sign reading "Freedom" during a demonstration in support of Catalan leader Quim Torra, in Barcelona, Spain January 3, 2020. REUTERS/Nacho Doce 

An army soldier rides through a wall of fluorescent tubes during India's Independence Day celebrations in Amritsar, India, August 15, 2019. REUTERS/Munish Sharma TPX IMAGES OF THE DAY 

A student works with an integrated fluorescence and electron microscope at the Nanocentre of the university KU Leuven "Katholieke Universiteit Leuven" in Leuven, Belgium April 18, 2019. Picture taken April 18, 2019. REUTERS/Piroschka van de Wouw 

Every day since Nov 17, people wearing fluorescent high-visibility jackets have protested against the squeeze on the household budgets of hard-pressed middle class and blue-collar workers. 

Every day since Nov 17, people wearing fluorescent high-visibility jackets have protested against the squeeze on the household budgets of hard-pressed middle class and blue-collar workers. embed code and instructions: https://reut.rs/2QM4kVZ 

Reuters photographer Yves Herman: "Usually, a golden rule for a news photographer covering a scene of angry confrontation is to get close, but not involved. Sometimes, though, it's hard to avoid. "Yellow vest" protests have in recent days spread to Belgium from France. I followed hundreds of people marching through Brussels on Saturday to demand lower fuel prices and better living conditions. They were blocked from reaching the government quarter by riot police using water cannon and tear gas. Some of the crowd hurled rocks and firecrackers at them. Police squads started surrounding protesters, sending in snatch teams to arrest individuals. As the march was organised on social media without approval from the authorities, police took the view that anyone involved could be detained and taken away. Most are quickly released without charge. When one young man was seized, a young woman with him rushed towards the line of police, shouting that he had done nothing wrong. She had no mask or helmet and nothing in her hands. She wasn't even wearing one of the fluorescent yellow vests adopted by the movement. As she yelled at a policewoman, another officer standing behind the front rank pointed and fired a pepper-spray gun, dousing the young woman in the face. The photo I took dramatically captured the white liquid's moment of impact and her anguished expression. She turned away crying and sat down on the road, her eyes and face inflamed. I had a bottle of eyewash as part of my own safety equipment. I put my camera down, asked her to look up and carefully dropped the soothing liquid into her eyes." REUTERS/Yves Herman/File photo SEARCH "TEARGAS HERMAN" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY. Matching text: BELGIUM-PROTESTS/IMAGE 

A black scorpion glows a fluorescent hue, coming from a substance naturally contained in its exoskeleton, as a man shines an ultra violet light onto it, in a tupperware box in Dublin, Ireland, November 4, 2018. REUTERS/Clodagh Kilcoyne 

A participant with her face decorated with fluorescent paint smiles before the YARKOcross Night Edition colour run race in Almaty, Kazakhstan September 15, 2018. REUTERS/Shamil Zhumatov TPX IMAGES OF THE DAY 

A participants run as she is sprayed with coloured fluorescent powder during the YARKOcross Night Edition colour run race in Almaty, Kazakhstan September 15, 2018. REUTERS/Shamil Zhumatov 

A participants walks as she is sprayed with coloured fluorescent powder during the YARKOcross Night Edition colour run race in Almaty, Kazakhstan September 15, 2018. REUTERS/Shamil Zhumatov 

Participants run through coloured fluorescent powder during the YARKOcross Night Edition colour run race in Almaty, Kazakhstan September 15, 2018. REUTERS/Shamil Zhumatov 

Participants with their faces decorated with fluorescent paint get ready for the YARKOcross Night Edition colour run race in Almaty, Kazakhstan September 15, 2018. REUTERS/Shamil Zhumatov 

A participant with her face decorated with fluorescent paint smiles before the YARKOcross Night Edition colour run race in Almaty, Kazakhstan September 15, 2018. REUTERS/Shamil Zhumatov 

A participant with his face decorated with fluorescent paint gets ready for the YARKOcross Night Edition colour run race in Almaty, Kazakhstan September 15, 2018. REUTERS/Shamil Zhumatov 

Participants with their faces decorated with fluorescent paint take a selfie as they prepare for the YARKOcross Night Edition colour run race in Almaty, Kazakhstan September 15, 2018. REUTERS/Shamil Zhumatov 

Participants with their faces decorated with fluorescent paint get ready for the YARKOcross Night Edition colour run race in Almaty, Kazakhstan September 15, 2018. REUTERS/Shamil Zhumatov 

A fluorescent pearl rosary glows under ultraviolet light in Wangen an der Aare, Switzerland, February 10, 2018. REUTERS/Stefan Wermuth SEARCH "RADIOACTIVE VINTAGE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A 1950's fluorescent pearl rosary sits on an Art-Deco burl wood desk in Wangen an der Aare, Switzerland, February 10, 2018. REUTERS/Stefan Wermuth SEARCH "RADIOACTIVE VINTAGE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Natalia Rollins children Noah,2, yawns as Bob Friedl, a senior project manager with Environmental Management Solutions of New York Inc., checks lead levels with an X-Ray fluorescence detector at their apartment in the Coney Island section of the Brooklyn borough of New York, U.S., October 27, 2017. Picture taken October 27, 2017. To match Special Report USA-LEAD/NEW YORK REUTERS/Shannon Stapleton 

Natalia Rollins children (L) Randy, 4, and Noah,2, watch television as Bob Friedl, a senior project manager with Environmental Management Solutions of New York Inc., checks lead levels with an X-Ray fluorescence detector at their apartment in the Coney Island section of the Brooklyn borough of New York, U.S., October 27, 2017. Picture taken October 27, 2017. To match Special Report USA-LEAD/NEW YORK REUTERS/Shannon Stapleton 

Workers put a fluorescent tube at a warehouse of the Supreme Electoral Tribunal (TSE), where election materials are stored, in Tegucigalpa, Honduras, November 6, 2017. REUTERS/Jorge Cabrera 

A pedestrian passes by fluorescent light tubes displayed outside a light bulb store in Tokyo's Akihabara district, Japan August 10, 2017. REUTERS/Toru Hanai 

Pedestrians walk near fluorescent light tubes displayed outside a light bulb store in Tokyo's Akihabara district, Japan August 10, 2017. REUTERS/Toru Hanai 

Used fluorescent light tubes and discarded public phone booths are seen at the ecological park Ita Enramada whose caretakers collect electronic waste, light tubes and batteries for their further recycling, in Asuncion, Paraguay June 5, 2017. Picture taken June 5, 2017. REUTERS/Jorge Adorno 

Used fluorescent light tubes are seen at the ecological park Ita Enramada whose caretakers collect electronic waste, light tubes and batteries for their further recycling, in Asuncion, Paraguay June 5, 2017. Picture taken June 5, 2017. REUTERS/Jorge Adorno 

A boy has his face painted with fluorescent paint during the Vivid Sydney festival of light and sound in Sydney, Australia, May 26, 2017. Picture taken May 26, 2017. REUTERS/Steven Saphore 

Dr. Michael Pittman from the University of Hong Kong's (HKU) Department of Earth Sciences poses with a copy of a life reconstruction of the bird-like feathered dinosaur Anchiornis, using the new body outline laser-stimulated fluorescence data, at the University of Hong Kong in Hong Kong, China March 1, 2017. REUTERS/Bobby Yip 

Dr. Michael Pittman from the University of Hong Kong's (HKU) Department of Earth Sciences poses with a projection of the reconstructed body outline of the bird-like feathered dinosaur Anchiornis, using the new body outline laser-stimulated fluorescence data, at HKU in Hong Kong, China March 1, 2017. REUTERS/Bobby Yip 

Dr. Michael Pittman from the University of Hong Kong's (HKU) Department of Earth Sciences speaks in front of a projection of the reconstructed body outline of the bird-like feathered dinosaur Anchiornis, using the new body outline laser-stimulated fluorescence data, at HKU in Hong Kong, China March 1, 2017. REUTERS/Bobby Yip 

Fluorescent tubes with barbed wire are seen before an extreme wrestling fight at a temporary wrestling ring in a car wash in Tulancingo Hidalgo, Mexico October 8, 2016. REUTERS/Carlos Jasso SEARCH "LUCHA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Wrestler known as Gio Malkriado (top) fights with a fluorescent tube with wrestler Ciclope during an extreme wrestling fight at a temporary wrestling ring inside a car wash in Tulancingo Hidalgo, Mexico October 8, 2016. REUTERS/Carlos Jasso SEARCH "LUCHA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

Wrestler known as Gio Malkriado (top) smashes a fluorescent tube on wrestler Ciclope during an extreme wrestling fight at a temporary wrestling ring inside a car wash in Tulancingo Hidalgo, Mexico October 8, 2016. REUTERS/Carlos Jasso SEARCH "LUCHA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

An Indian policeman rides through a wall of fluorescent tubes during India's Independence Day celebrations in Srinagar, August 15, 2016. REUTERS/Danish Ismail 

A broken fluorescent frame is seen hanging near an inscription of a burnt building belonging to Christ Holy Church International in Uzo Uwani village near Nimbo town in Nigeria's southeastern state of Enugu August 4, 2016. Picture taken August 4, 2016. REUTERS/Akintunde Akinleye.

Visitors walk among a glowing fluorescent sculpture as a light show is projected onto the Sydney Opera House on the second night of the annual Vivid Sydney light festival in Sydney, Australia, May 28, 2016. REUTERS/Jason Reed

An audience member wears an outfit bearing a fluorescent design before the runway show for fashion label Discount Universe during Australian Fashion week in Sydney, Australia May 18, 2016. REUTERS/Jason Reed 

A Kashmiri policeman rides through a wall of fluorescent tubes during India's Independence Day celebrations in Srinagar, August 15, 2015. REUTERS/Danish Ismail 

Villager Mohan Bharwad poses next to a Compact Fluorescent Lamp (CFL) powered by solar energy, outside his house on the outskirts of Gandhinagar, India, June 25, 2015. India's $100 billion push into solar energy over the next decade will be driven by foreign players as uncompetitive local manufacturers fall by the wayside, no longer protected by government restrictions on the sector. Picture taken June 25, 2015. To match INDIA-SOLAR/ REUTERS/Amit Dave 

Toshiba Corp's circular fluorescent light bulbs are on display at an electronics retailer in Tokyo, Japan, June 25, 2015. Toshiba Corp may appoint more outside board members to help prevent a recurrence of accounting irregularities that are currently under investigation, the company's CEO said on Thursday. REUTERS/Yuya Shino 

A tourist looks at Yellow and Green Fluorescent Light by Dan Flavin from the Seeing Through Light selections from the Guggenheim Abu Dhabi collection at the Manarat Al Saadiyat Gallery in Abu Dhabi November 27, 2014. Thanks to oil revenues, the desert nation of seven emirates has been on an art-investing binge for three decades that has, for those with deep pockets, made it the region's prime fine art market. Picture taken November 27, 2014.
REUTERS/Caren Firouz

A woman holds an incense stick as she prays in front of a Compact Fluorescent Lamp (CFL) powered by solar energy, in her house, on the outskirts of the western Indian city of Ahmedabad October 27, 2014. Factories and businesses have installed over 30 MW of rooftop solar panels in the last year, data compiled by New Delhi-based consultancy Bridge To India shows. That is a small amount compared with India's solar capacity of 2,700 MW, but demand may accelerate under Prime Minister Narendra Modi who has made renewable energy a priority. Bridge to India forecasts compound annual growth will hit more than 60 percent in the next five years, as falling panel prices make installations more alluring. To match INDIA-SOLAR/ Picture taken October 27, 2014. REUTERS/Amit Dave (INDIA - Tags: ENERGY BUSINESS POLITICS ENVIRONMENT RELIGION) 

Members of the local surfing community wear fluorescent costumes as they carry their boards into the surf and others swim at Sydney's Bondi Beach October 10, 2014. The colorful event was organised to raise awareness and show support for mental disorders on World Mental Health Day. REUTERS/David Gray (AUSTRALIA - Tags: SOCIETY ENVIRONMENT) 

Members of the local surfing community wear fluorescent costumes as they stand in a line to form a 'fluro wave' on Sydney's Bondi Beach October 10, 2014. The colorful event was organised to raise awareness and show support for mental disorders on World Mental Health Day. REUTERS/David Gray (AUSTRALIA - Tags: SOCIETY ENVIRONMENT) 

Members of the local surfing community wear fluorescent costumes as they stand in a line to form a 'fluro wave' on Sydney's Bondi Beach October 10, 2014. The colorful event was organised to raise awareness and show support for mental disorders on World Mental Health Day. REUTERS/David Gray (AUSTRALIA - Tags: SOCIETY ENVIRONMENT) 

Members of the local surfing community wear fluorescent costumes as they stand in a line to form a 'fluro wave' on Sydney's Bondi Beach October 10, 2014. The colorful event was organised to raise awareness and show support for mental disorders on World Mental Health Day. REUTERS/David Gray (AUSTRALIA - Tags: SOCIETY ENVIRONMENT) 

Members of the local surfing community wear fluorescent costumes as they stretch and carry their boards at sunrise on Sydney's Bondi Beach October 10, 2014. The colorful event was organised to raise awareness and show support for mental disorders on World Mental Health Day. REUTERS/David Gray (AUSTRALIA - Tags: SOCIETY ENVIRONMENT) 

A Kashmiri policeman rides through a wall of fluorescent tubes during India's Independence Day celebrations in Srinagar August 15, 2014. REUTERS/Danish Ismail (INDIAN-ADMINISTERED KASHMIR - Tags: ANNIVERSARY SOCIETY) 

Toshiba Corp's circular fluorescent light bulbs are on display at an electronics retail store in Tokyo July 31, 2014. Toshiba Corp, the world's No.2 producer of NAND flash memory chips for smartphones, posted a 57 percent increase in operating profit for the April-June quarter compared to a year ago, boosted by growth in smartphone demand. REUTERS/Yuya Shino (JAPAN - Tags: BUSINESS) 

Jhon Nevado shows fluorescent roses that were produced at Nevados plantation in Latacunga, some 98 km (61 miles) south of Quito January 28, 2014. REUTERS/Guillermo Granja (ECUADOR - Tags: SOCIETY) 

An army soldier rides through a wall of fluorescent tubes during India's 67th Independence Day celebrations in the southern Indian city of Bangalore August 15, 2013. REUTERS/Stringer (INDIA - Tags: MILITARY SOCIETY ANNIVERSARY) 

Graduate student Giulia Agliardi, from Milan, Italy, uses a fluorescence microscope to study cancer cells in the Nanomedicine Lab at UCL's School of Pharmacy in London May 2, 2013. Is nanomedicine the next big thing? A growing number of top drug companies seem to think so. The ability to encapsulate potent drugs in nanoparticles measuring billionths of a metre in diameter is opening up new options for super-accurate drug delivery, increasing precision hits at the site of disease with, hopefully, fewer side effects. Photograph taken on May 2, 2013. REUTERS/Suzanne Plunkett (BRITAIN - Tags: BUSINESS EDUCATION HEALTH SOCIETY SCIENCE TECHNOLOGY) 

Alain Juppe, Mayor of Bordeaux, speaks during a news conference to present the "Pibal" public bicycle designed by French designer Philippe Starck at the Bordeaux city hall February 19, 2013. The hybrid bicycle, which will be available to the public from September 2013, has a central platform allowing the rider to push it like a scooter during heavy traffic, and has fluorescent tyres for security at night. REUTERS/Regis Duvignau (FRANCE - Tags: BUSINESS SOCIETY POLITICS HEADSHOT) 

Alain Juppe, Mayor of Bordeaux, reacts as he attends a news conference to present the "Pibal" public bicycle designed by French designer Philippe Starck at the Bordeaux city hall February 19, 2013. The hybrid bicycle, which will be available to the public from September 2013, has a central platform allowing the rider to push it like a scooter during heavy traffic, and has fluorescent tyres for security at night. REUTERS/Regis Duvignau (FRANCE - Tags: BUSINESS SOCIETY POLITICS HEADSHOT) 

French designer Philippe Starck attends a news conference to present his "Pibal" public bicycle at the Bordeaux city hall February 19, 2013. The hybrid bicycle, which will be available to the public from September 2013, has a central platform allowing the rider to push it like a scooter during heavy traffic, and has fluorescent tyres for security at night. REUTERS/Regis Duvignau (FRANCE - Tags: BUSINESS SOCIETY HEADSHOT) 

Alain Juppe, Mayor of Bordeaux, arrives with the "Pibal" public bicycle designed by French designer Philippe Starck to attend a presentation at the Bordeaux city hall February 19, 2013. The hybrid bicycle, which will be available to the public from September 2013, has a central platform allowing the rider to push it like a scooter during heavy traffic, and has fluorescent tyres for security at night. REUTERS/Regis Duvignau (FRANCE - Tags: BUSINESS SOCIETY) 

French designer Philippe Starck poses with his "Pibal" public bicycle during a presentation at the Bordeaux city hall February 19, 2013. The hybrid bicycle, which will be available to the public from September 2013, has a central platform allowing the rider to push it like a scooter during heavy traffic, and has fluorescent tyres for security at night. REUTERS/Regis Duvignau (FRANCE - Tags: BUSINESS SOCIETY) 

Alain Juppe, Mayor of Bordeaux, poses with the "Pibal" public bicycle designed by French designer Philippe Starck during a presentation at the Bordeaux city hall February 19, 2013. The hybrid bicycle, which will be available to the public from September 2013, has a central platform allowing the rider to push it like a scooter during heavy traffic, and has fluorescent tyres for security at night. REUTERS/Regis Duvignau (FRANCE - Tags: BUSINESS SOCIETY)