Signage for protocols against the coronavirus disease (COVID-19) are seen on the floor before entering a lab that is turning algae into renewable and biodegradable polyurethanes on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

Algae is seen after going through an extraction process as it is turned into renewable and biodegradable polyurethane on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

A chart showing the breakdown of the biodegradation of polyurethane made from algae is shown in a lab on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake,

A small continuous pump system that helps turn algae into renewable and biodegradable polyurethane is seen in a lab on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

UC San Diego chemistry professor Michael Burkart (R) is seen in a lab where he and his students are making algae into flip-flops after inventing a way to make renewable and biodegradable polyurethanes from algae they grow in a greenhouse on campus in UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

Flip-Flops made from algae that was turned into biodegradable and renewable polyurethane are shown on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

UC San Diego chemistry professor Michael Burkart is reflected in a lab window next to an algae greenhouse on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

UC San Diego chemistry professor Michael Burkart walks into one of his labs next to a greenhouse used to grow algae on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

UC San Diego chemistry professor Michael Burkart stands next to a greenhouse used to grow algae on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

UC San Diego chemistry professor Michael Burkart poses for a picture as he and his students are making flip-flops after inventing a way to make renewable and biodegradable polyurethanes from algae they grow in a greenhouse lab on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

Algae is grown in a green house before being turned into renewable and biodegradable polyurethanes on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

UC San Diego chemistry professor Michael Burkart looks over algae as it is grown in a green house before being turned into renewable and biodegradable polyurethanes on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

UC San Diego chemistry professor Michael Burkart looks over algae as it is grown in a green house before being turned into renewable and biodegradable polyurethanes on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

Renewable and biodegradable polyurethane made from algae and turned into a flip-flop is shown at a lab on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

Extracted chemicals from algae are shown in a lab on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

A renewable and biodegradable polyurethane made from algae is shown at a lab on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

Renewable and biodegradable polyurethane made from algae and turned into a flip-flop is shown at a lab on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

Control modules that maintain a small continuous production system that helps turn algae into renewable and biodegradable polyurethanes are shown in a lab on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

A small continuous production system that helps turn algae into renewable and biodegradable polyurethanes is shown in a lab on campus at UC San Diego, in San Diego, California, U.S., August 12, 2020. REUTERS/Mike Blake

Denise Yearwood, 54, from Umatilla, collects money after playing a sweepstake game at Flip Flops II internet cafe, which is experiencing a decrease of patrons amid coronavirus (COVID-19) cases in The Villages, Florida, U.S. March 16, 2020. On going to Internet cafes as the coronavirus spreads, Yearwood says, “You know what, we can’t live our entire lives being afraid. My mom works at Walmart; she’s 73. I’m careful, even when delivering pizzas -- I use sanitizer every time. So you can just do your best, and that’s it. My son, he’s 17, and we’re just waiting for the restaurant where he works to close. He and his buddies just went to Daytona to celebrate spring break. You can’t live your life in fear -- you can just take precautions and what’s going to happen, will happen." REUTERS/Yana Paskova

A note warning against stealing toilet paper hangs in the bathroom of Flip Flops II internet cafe, which is experiencing a decrease of patrons amid coronavirus (COVID-19) cases in The Villages, Florida, U.S. March 16, 2020. REUTERS/Yana Paskova

Denise Yearwood, 54, from Umatilla, plays a sweepstake game at Flip Flops II internet cafe, which is experiencing a decrease of patrons amid coronavirus (COVID-19) cases in The Villages, Florida, U.S. March 16, 2020. On going to Internet cafes as the coronavirus spreads, Yearwood says, “You know what, we can’t live our entire lives being afraid. My mom works at Walmart; she’s 73. I’m careful, even when delivering pizzas -- I use sanitizer every time. So you can just do your best, and that’s it. My son, he’s 17, and we’re just waiting for the restaurant where he works to close. He and his buddies just went to Daytona to celebrate spring break. You can’t live your life in fear -- you can just take precautions and what’s going to happen, will happen." REUTERS/Yana Paskova

Denise Yearwood, 54, from Umatilla, plays a sweepstake game at Flip Flops II internet cafe, which is experiencing a decrease of patrons amid coronavirus (COVID-19) cases in The Villages, Florida, U.S. March 16, 2020. On going to Internet cafes as the coronavirus spreads, Yearwood says, "You know what, we can't live our entire lives being afraid. My mom works at Walmart; she's 73. I'm careful, even when delivering pizzas -- I use sanitizer every time. So you can just do your best, and that's it. My son, he's 17, and we're just waiting for the restaurant where he works to close. He and his buddies just went to Daytona to celebrate spring break. You can't live your life in fear -- you can just take precautions and what's going to happen, will happen." REUTERS/Yana Paskova

Kayapo indigenous children throw their flip flops to drop guava from a tree in Bau village near Novo Progresso, Para state, Brazil September 12, 2019. Picture taken September 12, 2019. REUTERS/Amanda Perobelli

Abandoned flip flops are seen by a migrant crossing on the Rio Grande near Mission, Texas, U.S., August 22, 2019. REUTERS/Loren Elliott

A pair of flip-flops with a flower sit among the other pairs of painted white shoes, laid out at All Souls Church, in memory of the victims of Friday's shooting, in Christchurch, New Zealand March 19, 2019. REUTERS/Jorge Silva

Backpacks, bags and flip flops are seen in a store in the Central Market in San Jose, Costa Rica March 13, 2019. REUTERS/Juan Carlos Ulate

The flip flops of Papua New Guinea table tennis player Gasika Sepa can be seen under a table as he practices at a Beijing-funded facility in central Port Moresby in Papua New Guinea, November 19, 2018. Picture taken November 19, 2018. REUTERS/David Gray TPX IMAGES OF THE DAY

The flip flops of Papua New Guinea table tennis player Gasika Sepa can be seen under a table as he practices at a Beijing-funded facility in central Port Moresby in Papua New Guinea, November 19, 2018. Picture taken November 19, 2018. REUTERS/David Gray

The flip flops and feet of Papua New Guinea table tennis player Gasika Sepa can be seen under a table as he practices at a Beijing-funded facility in central Port Moresby in Papua New Guinea, November 19, 2018. Picture taken November 19, 2018. REUTERS/David Gray

The flip flops of Papua New Guinea table tennis player Gasika Sepa can be seen under a table as he practices at a Beijing-funded facility in central Port Moresby in Papua New Guinea, November 19, 2018. Picture taken November 19, 2018. REUTERS/David Gray

The bags, hats and flip flops of Papua New Guinea table tennis players can be seen against a wall during a practice session at a Beijing-funded facility in central Port Moresby in Papua New Guinea, November 19, 2018. Picture taken November 19, 2018. REUTERS/David Gray

REFILE - REMOVING MATERIAL A flip-flop is seen on the sand at Maccarese beach, west of Rome, Italy November 21, 2018. REUTERS/Max Rossi

Plastic bottles and a flip-flop lie on the sand at Maccarese beach in Rome, Italy, November 21, 2018. REUTERS/Max Rossi

A flip-flop made of plastic is seen on the sand at Maccarese beach, west of Rome, Italy November 21, 2018. REUTERS/Max Rossi

Rescue team members show a flip-flop of that belonged to a passenger of Lion Air flight JT610 to family members at Tanjung Priok port in Jakarta, Indonesia, October 31, 2018. REUTERS/Beawiharta

Brazilians stand in line outside a polling station to cast their votes in a runoff election, in Rio de Janeiro, Brazil October 28, 2018. REUTERS/Sergio Moraes

A man steps on a crack in a road at Balaroa neighbourhood hit by the earthquake and liquefaction in Palu, Central Sulawesi, Indonesia, October 10, 2018. REUTERS/Jorge Silva

He fled hardship and unrest in Congo Republic with nothing but his ball and a change of clothes. Now, not yet 18, Christ Wamba is training with a professional basketball club in Europe. Taking a well-trodden route north out of sub-Saharan Africa, Wamba clung on to his treasured ball until he had to jettison it on the sea crossing from Turkey to Greece. He is now under the wing of one the country's biggest clubs, Aris, as he waits for his asylum application to be processed. "I didn't have shoes to play basket," Wamba, a towering figure with boyish looks and bleached hair, said of life in Congo, a nation rife with poverty despite its oil wealth. "I played with flip-flops. Sometimes with nothing, without shoes, with only my legs, with blood sometimes," he said. REUTERS/Alkis Konstantinidis SEARCH "KONSTANTINIDIS WAMBA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY. Matching text: EUROPE-MIGRANTS/GREECE-WAMBA

A wet dog waits with his owners as they await rescue from rising flood waters in the aftermath of Hurricane Florence in Leland, North Carolina, U.S., September 16, 2018. REUTERS/Jonathan Drake

Flip-flops are seen on display before the launch ceremony of Flipflopi, the first dhow boat made entirely of recycled plastic on the island of Lamu, Kenya, September 15, 2018. REUTERS/Baz Ratner

Catholic worshiper holds a rosary as she takes part in celebrations of the Assumption of Mary at Jasna Gora Monastery in Czestochowa, Poland August 15, 2018. REUTERS/Kacper Pempel TPX IMAGES OF THE DAY

Catholic worshiper holds a rosary as she takes part in celebrations of the Assumption of Mary at Jasna Gora Monastery in Czestochowa, Poland August 15, 2018. REUTERS/Kacper Pempel

A customer with wearing flip flops is pictured at the Angiyok ice bar, which maintains around -10 degrees Celsius (14 degrees Fahrenheit), in Berlin, Germany, July 25, 2018. REUTERS/Fabrizio Bensch

A pair of flip-flops are seen on a truck during a protest against Nicaraguan President Daniel Ortega's government in Jinotepe, Nicaragua July 5, 2018.REUTERS/Oswaldo Rivas

Flip-flops are seen on a floating soccer pitch in the fishing village of Ko Panyi in southern Phang Nga Province, Thailand, May 20, 2018. REUTERS/Soe Zeya Tun SEARCH "FOOTBALL GLOBAL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A pair of flip-flops lie on the ground as children play soccer by the Botataung Pagoda in Yangon, Myanmar, May 23, 2018. REUTERS/Ann Wang SEARCH "FOOTBALL GLOBAL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A combination picture shows children playing soccer (top), and details of flip-flops, a football and a pitch by the Botataung Pagoda in Yangon, Myanmar, May 18 - May 23, 2018. REUTERS/Ann Wang SEARCH "FOOTBALL GLOBAL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

A combination picture shows children playing soccer on a floating pitch (top), and details of a pitch, flip-flops and a football, in the fishing village of Ko Panyi in southern Phang Nga Province, Thailand, May 19 - May 21, 2018. REUTERS/Soe Zeya Tun SEARCH "FOOTBALL GLOBAL" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

A woman wearing flip-flops walks through puddles during heavy rain in central London, Britain, May 29, 2018. REUTERS/Peter Nicholls

A woman selling flip flops waits for customers at an underground walkway in Kiev, Ukraine April 11, 2018. REUTERS/Gleb Garanich

Debris is seen as water levels fall at Voelvlei dam, one of the regions largest water catchment dams, near Cape Town, South Africa, December 5, 2017. Picture taken December 5, 2017. REUTERS/Mike Hutchings

People take part in the "March for Our Lives", an organized demonstration to end gun violence in the United States, outside the U.S. Consulate in Sao Paulo, Brazil, March 24, 2018. REUTERS/Nacho Doce

A Congolese child used in armed conflicts receives psycho-social support at the Centre for Orientation and Transit (COT) for Children associated with militias in Mbuji Mayi, Kasai Oriental Province in the Democratic Republic of Congo, March 14, 2018. Picture taken March 14, 2018. REUTERS/Thomas Mukoya

A man wears a dress as he attends a march to mark International Women's Day in Santiago, Chile March 8, 2018. REUTERS/Ivan Alvarado

An internally displaced Syrian girl stands in the mud after heavy rain at a camp on the outskirts of Azaz, Syria January 26, 2018. REUTERS/Umit Bektas TPX IMAGES OF THE DAY

An internally displaced Syrian girl stands in the mud after heavy rain at a camp on the outskirts of Azaz, Syria January 26, 2018. REUTERS/Umit Bektas

Flip-flops belonging to Rohingya refugees are pictured outside a mosque as they attend Friday prayers at Balukhali refugee camp near Cox's Bazar, Bangladesh November 10, 2017. REUTERS/Navesh Chitrakar TPX IMAGES OF THE DAY

Flip-flops belonging to Rohingya refugees are pictured outside a mosque as they attend Friday prayers at Balukhali refugee camp near Cox's Bazar, Bangladesh November 10, 2017. REUTERS/Navesh Chitrakar

A Rohingya refugee arrives at a camp in Cox's Bazar, Bangladesh September 18, 2017. REUTERS/Cathal McNaughton TPX IMAGES OF THE DAY