Professor Andrew Parker poses for a photograph amongst examples of his invention "Pure Structural Colour" at the Naturally Brilliant Colour exhibition at Kew Gardens, in London, Britain, May 6, 2021. Picture taken May 6, 2021. REUTERS/John Sibley

Sarah Farrell, member of staff at the Royal Botanic Gardens, poses for a photograph in front of "Kaleidoscope" at the Naturally Brilliant Colour exhibition at Kew Gardens, in London, Britain, May 6, 2021. Picture taken May 6, 2021. REUTERS/John Sibley

Sarah Farrell, member of staff at the Royal Botanic Gardens, poses for a photograph in front of "Kaleidoscope" at the Naturally Brilliant Colour exhibition at Kew Gardens, in London, Britain, May 6, 2021. Picture taken May 6, 2021. REUTERS/John Sibley

Professor Andrew Parker poses for a photograph amongst examples of his invention "Pure Structural Colour" at the Naturally Brilliant Colour exhibition at Kew Gardens, in London, Britain, May 6, 2021. Picture taken May 6, 2021. REUTERS/John Sibley

Professor Andrew Parker poses for a photograph amongst examples of his invention "Pure Structural Colour" at the Naturally Brilliant Colour exhibition at Kew Gardens, in London, Britain, May 6, 2021. Picture taken May 6, 2021. REUTERS/John Sibley

Professor Andrew Parker poses for a photograph amongst examples of his invention "Pure Structural Colour" at the Naturally Brilliant Colour exhibition at Kew Gardens, in London, Britain, May 6, 2021. Picture taken May 6, 2021. REUTERS/John Sibley

Professor Andrew Parker poses for a photograph amongst examples of his invention "Pure Structural Colour" at the Naturally Brilliant Colour exhibition at Kew Gardens, in London, Britain, May 6, 2021. Picture taken May 6, 2021. REUTERS/John Sibley

Doctor Simon Little of Johanniter air rescue attends to a patient with serious breathing problems during the flight from Gruenberg to a hospital in Bad Hersfeld, as the spread of the coronavirus disease (COVID-19) continues, in Germany, April 25, 2021. REUTERS/Kai Pfaffenbach

A patient with serious breathing problems is attended to by Doctor Simon Little of Johanniter air rescue prior to the flight from Gruenberg to a hospital in Bad Hersfeld, as the spread of the coronavirus disease (COVID-19) continues, in Germany, April 25, 2021. REUTERS/Kai Pfaffenbach

Doctor Simon Little of Johanniter air rescue attends to a patient with serious breathing problems prior to the flight from Gruenberg to a hospital in Bad Hersfeld, as the spread of the coronavirus disease (COVID-19) continues, in Germany, April 25, 2021. REUTERS/Kai Pfaffenbach

A Johanniter air rescue helicopter and crew members are seen on a soccer pitch prior to transporting a patient with serious breathing problems from Gruenberg to a hospital in Bad Hersfeld, as the spread of the coronavirus disease (COVID-19) continues, in Gruenberg, Germany, April 25, 2021. REUTERS/Kai Pfaffenbach TPX IMAGES OF THE DAY

A Johanniter air rescue helicopter and crew members are seen on a soccer pitch prior to transporting a patient with serious breathing problems from Gruenberg to a hospital in Bad Hersfeld, as the spread of the coronavirus disease (COVID-19) continues, in Gruenberg, Germany, April 25, 2021. REUTERS/Kai Pfaffenbach

A Johanniter air rescue helicopter is seen on a soccer pitch prior to transporting a patient with serious breathing problems from Gruenberg to a hospital in Bad Hersfeld, as the spread of the coronavirus disease (COVID-19) continues, in Gruenberg, Germany, April 25, 2021. REUTERS/Kai Pfaffenbach

A Johanniter air rescue helicopter is seen on a soccer pitch prior to transporting a patient with serious breathing problems from Gruenberg to a hospital in Bad Hersfeld, as the spread of the coronavirus disease (COVID-19) continues, in Gruenberg, Germany, April 25, 2021. REUTERS/Kai Pfaffenbach

Woo Jung-min, 35, a haenyeo, also known as a "sea woman", dives into the water near a man fishing, as she works in the sea off Geoje, South Korea, March 31, 2021. "If we each collected 500 kilograms worth of sea cucumbers last year, this year it's only half that," Woo said. "The problems seem very real to us. Today, I'm thinking once again 'this is really serious.'" REUTERS/Kim Hong-Ji SEARCH "HAENYEO HONG-JI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY.

Woo Jung-min, 35, a haenyeo, also known as a "sea woman", poses for a photograph with sea cucumbers that she harvested in the sea off Geoje, South Korea, March 31, 2021. "If we each collected 500 kilograms worth of sea cucumbers last year, this year it's only half that," Woo said. "The problems seem very real to us. Today, I'm thinking once again 'this is really serious.'" REUTERS/Kim Hong-Ji SEARCH "HAENYEO HONG-JI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Woo Jung-min, 35, a haenyeo, also known as a "sea woman", dives into the water as she works in the sea off Geoje, South Korea, March 30, 2021. "If we each collected 500 kilograms worth of sea cucumbers last year, this year it's only half that," Woo said. "The problems seem very real to us. Today, I'm thinking once again 'this is really serious.'" REUTERS/Kim Hong-Ji SEARCH "HAENYEO HONG-JI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Flavio Falcone, a psychiatrist, hugs a man as Andrea Macera, who works as an actress and a clown, talks to other men as they check on people in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 9, 2021. Costumed as a jester with a bright red nose, Falcone has become an icon in Brazil's crackland. Falcone's patients know him as The Clown, not as a doctor. "This character represents the exposure of mistakes, of the fragility of what exists in the shadow. The exposure of failures," said Falcone. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

People are seen in the area known as the "flow" where people buy and use drugs in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 9, 2021. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Nelson Isaias da Silva, 45, who is homeless, lies on a blanket next to a book titled "Brazil's history" at Princesa Isabel square in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 11, 2021. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Tents stand at Princesa Isabel square, where homeless people live in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 18, 2021. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Men prepare to smoke crack in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 11, 2021. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A man smokes crack in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 11, 2021. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Flavio Falcone, a psychiatrist, talks to homeless people in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 9, 2021. Costumed as a jester with a bright red nose, Falcone has become an icon in Brazil's crackland. Falcone's patients know him as The Clown, not as a doctor. "This character represents the exposure of mistakes, of the fragility of what exists in the shadow. The exposure of failures," said Falcone. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

Flavio Falcone, a psychiatrist, puts on makeup as he prepares to perform as a clown, at his house two blocks from an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 11, 2021. Costumed as a jester with a bright red nose, Falcone has become an icon in Brazil's crackland. Falcone's patients know him as The Clown, not as a doctor. "This character represents the exposure of mistakes, of the fragility of what exists in the shadow. The exposure of failures," said Falcone. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A man smokes crack in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 11, 2021. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Lighters are lit up as people smoke crack at a place known as the "flow", where people buy and use drugs in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 9, 2021. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Gabriella da Silva, 22, prepares coffee as Jailson Antonio de Oliveira, 51, kisses her in the room that they live in Sao Paulo, Brazil, March 11, 2021. "Today I have a better life because of Flavio Falcone, the clown," said Oliveira, who has the word 'palhaco' ('clown' in Portuguese) tattooed on his wrist in honor of Flavio Falcone. "He's my right arm, he helps with everything he can." REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Jailson Antonio de Oliveira shows his wrist which is tattooed with the word 'palhaco' ('clown' in Portuguese) in honour of Flavio Falcone, for a photo, in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 11, 2021. "Today I have a better life because of Flavio Falcone, the clown," said Oliveira. "He's my right arm, he helps with everything he can." REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Andrea Macera, who works as an actress and a clown, puts on makeup as she prepares to perform as Mafalda Mafalda, her clown character's name, at the Psychiatrist Flavio Falcone's house, near an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 2, 2021. "The street is crowded, the street is bleeding. We are in the worst moment of humanity," said Macera. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Flavio Falcone, a psychiatrist, talks to a woman during a medical consultation as part of a project called 'Teto, Trampo e Tratamento' ('Roof, Work and Treatment' in Portuguese) at Container Theatre in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 3, 2021. Costumed as a jester with a bright red nose, Falcone has become an icon in Brazil's crackland. Falcone's patients know him as The Clown, not as a doctor. "This character represents the exposure of mistakes, of the fragility of what exists in the shadow. The exposure of failures," said Falcone. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Flavio Falcone, a psychiatrist, wears gloves and a protective face mask in the elevator of the building where he lives as he makes his way to perform as a clown in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 11, 2021. Costumed as a jester with a bright red nose, Falcone has become an icon in Brazil's crackland. Falcone's patients know him as The Clown, not as a doctor. "This character represents the exposure of mistakes, of the fragility of what exists in the shadow. The exposure of failures," said Falcone. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES TPX IMAGES OF THE DAY

Andrea Macera, who works as an actress and a clown, dances in her costume dressed as Mafalda Mafalda, her clown character's name, near homeless people in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 11, 2021. "The street is crowded, the street is bleeding. We are in the worst moment of humanity," said Macera. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Flavio Falcone, a psychiatrist, and Andrea Macera, who works as an actress and a clown, talk to a young man known as Nego Bala, 23, (center) who was born and raised in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 9, 2021. "When I was born, crackland already existed. People need to stop blaming who is in crackland. When everyone was born, the evil already existed," Bala said. "Instead of stigmatizing crackland, why don't you invest in humanizing and helping these people?" REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Antonio Carlos Nascimento, 53, known as 'Kawex' sings during an activity called "radio" time in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, February 11, 2021. During "radio" time, which is organized by Flavio Falcone and Andrea Macera, homeless people in crackland can request songs and even rap along as part of a project run by Falcone and Macera. "Sao Paulo at night, the world is divided in two. Another world that no one wants to see, a world where one cannot distinguish love from evil which comes to life when our city grows dark. Between world and underworld there is no luck and bad luck," said Nascimento. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Luiz Fernando de Paula, 32, a barber who is homeless, cuts the hair of Ivair 'Pele', 45, at Princesa Isabel square, in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 9, 2021. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Jonatha de David Sousa Reis, 34, and Bruna Kelly Simoes, 26, wait in a queue to receive donated food at Princesa Isabel square, in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 18, 2021. After a delay in congressional approval, payments are set to resume this month at an even lower rate. For many, that help is too little, too late. Millions have sunk into poverty since the start of the year. For Reis and Simoes, that meant losing their home. The couple moved into a makeshift tent, strung between two trees, on a public square in crackland this year. "As long as there are no jobs, the emergency payment should have been maintained as it was," Reis said. "It's been difficult, very difficult," said Reis. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Jonatha de David Sousa Reis, 34, and Bruna Kelly Simoes, 26, talk inside the tent that they currently live in at Princesa Isabel square, in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 23, 2021. After a delay in congressional approval, payments are set to resume this month at an even lower rate. For many, that help is too little, too late. Millions have sunk into poverty since the start of the year. For Reis and Simoes, that meant losing their home. The couple moved into a makeshift tent, strung between two trees, on a public square in crackland this year. "As long as there are no jobs, the emergency payment should have been maintained as it was," Reis said. "It's been difficult, very difficult," said Reis. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Jailson Antonio de Oliveira, 51, poses for a picture in his room in Sao Paulo, Brazil, March 11, 2021. "Today I have a better life because of Flavio Falcone, the clown," said Oliveira, who has the word 'palhaco' ('clown' in Portuguese) tattooed on his wrist in honor of Flavio Falcone. "He's my right arm, he helps with everything he can." REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

People who are homeless sleep under the Duque de Caxias monument at Princesa Isabel square, in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 18, 2021. Duke of Caxias was an army officer, politician and monarchist of the Empire of Brazil. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Jonatha de David Sousa Reis, 34, and Bruna Kelly Simoes, 26, wait for their mobile phones to charge at a Psychosocial Care Center near Princesa Isabel square, in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 11, 2021. The homeless population has surged after 600 reais ($106.16) per month government emergency aid payments to the poor were reduced and eventually ran out at the end of 2020. After a delay in congressional approval, payments are set to resume this month at an even lower rate. For many, that help is too little, too late. Millions have sunk into poverty since the start of the year. For Reis and Simoes, that meant losing their home. The couple moved into a makeshift tent, strung between two trees, on a public square in crackland this year. "As long as there are no jobs, the emergency payment should have been maintained as it was," Reis said. "It's been difficult, very difficult," said Reis. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

A man who is homeless sleeps at Princesa Isabel square in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 4, 2021. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Men who are homeless play dominoes at Princesa Isabel square in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 4, 2021. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Jonatha de David Sousa Reis, 34, and Bruna Kelly Simoes, 26, talk inside the tent that they currently live in at Princesa Isabel square, in an area known as "cracolandia," or crackland, a dangerous wasteland of about eight blocks in the historic center of Sao Paulo, Brazil, March 9, 2021. After a delay in congressional approval, payments are set to resume this month at an even lower rate. For many, that help is too little, too late. Millions have sunk into poverty since the start of the year. For Reis and Simoes, that meant losing their home. The couple moved into a makeshift tent, strung between two trees, on a public square in crackland this year. "As long as there are no jobs, the emergency payment should have been maintained as it was," Reis, 34, said. "It's been difficult, very difficult," said Reis. REUTERS/Amanda Perobelli SEARCH "CRACKLAND PEROBELLI" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES

Rescue workers on small boats help residents in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe

A submerged car is seen in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe

A resident walks on a makeshift walkway in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe

A resident walks on a makeshift walkway in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe

Rescue workers on small boats help residents in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe TPX IMAGES OF THE DAY

A resident talks to journalists in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe

Rescue workers on small boats help residents in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe

A rescue workers walks in a flooded area to help residents as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe

Rescue workers on small boats help residents in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe

A resident stands at the window of his house in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, February 8, 2021. REUTERS/Stephane Mahe TPX IMAGES OF THE DAY

A submerged car is seen in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe

Rescue workers on small boats help residents in a flooded area as the Charente River overflows in Saintes after days of rainy weather causing flooding in western France, France, February 8, 2021. REUTERS/Stephane Mahe