Eighteen-month-old twin pandas Bao Di and Bao Mei and their mother Hao Hao play in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

Eighteen-month-old twin panda Bao Di and his mother Hao Hao play in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

Eighteen-month-old twin panda Bao Di and his mother Hao Hao play in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

Eighteen-month-old twin pandas Bao Di and Bao Mei play in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

Eighteen-month-old twin pandas Bao Di and Bao Mei and their mother Hao Hao play in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

Eighteen-month-old twin pandas Bao Di and Bao Mei and their mother Hao Hao play in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

Eighteen-month-old twin pandas Bao Di and Bao Mei and their mother Hao Hao play in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

Eighteen-month-old twin pandas Bao Di and Bao Mei and their mother Hao Hao play in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

Eighteen-month-old twin pandas Bao Di and Bao Mei and their mother Hao Hao play in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

One of the two eighteen-month-old twin pandas plays in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

One of the two eighteen-month-old twin pandas plays in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman TPX IMAGES OF THE DAY

One of the two eighteen-month-old twin pandas plays in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

One of the two eighteen-month-old twin pandas plays in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

One of the two eighteen-month-old twin pandas plays in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

One of the two eighteen-month-old twin pandas plays in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

One of the two eighteen-month-old twin pandas plays in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

One of the two eighteen-month-old twin pandas plays in snow at Pairi Daiza zoo in Brugelette, Belgium, February 9, 2021. REUTERS/Yves Herman

A nurse holds conjoined twins Muhammad and Ahmad Yasser al-Bukhaiti inside an ambulance at Sanaa airport as they wait to be airlifted for a separation surgery in Jordan, Sanaa, Yemen February 6, 2021. REUTERS/Khaled Abdullah

A nurse holds conjoined twins Muhammad and Ahmad Yasser al-Bukhaiti inside an ambulance at Sanaa airport as they wait to be airlifted for a separation surgery in Jordan, Sanaa, Yemen February 6, 2021. REUTERS/Khaled Abdullah

Conjoined twins Muhammad and Ahmad Yasser al-Bukhaiti are pictured inside an ambulance at Sanaa airport as they wait to be airlifted for a separation surgery in Jordan, Sanaa, Yemen February 6, 2021. REUTERS/Khaled Abdullah

A combination picture shows Swiss concept artists Frank and his twin-brother Patrik Riklin performing during the presentation of their "Fondation Riklin" project in Regensdorf, Switzerland January 22, 2021. Picture taken January 22, 2021. REUTERS/Arnd Wiegmann

Swiss concept artists and twin brothers Frank and Patrik Riklin perform during the presentation of their "Fondation Riklin" project in Regensdorf, Switzerland January 22, 2021. Picture taken January 22, 2021. REUTERS/Arnd Wiegmann TPX IMAGES OF THE DAY

Swiss concept artists Frank and his twin-brother Patrik Riklin perform during the presentation of their "Fondation Riklin" project in Regensdorf, Switzerland January 22, 2021. Picture taken January 22, 2021. REUTERS/Arnd Wiegmann

Swiss concept artists Frank and his twin-brother Patrik Riklin perform during the presentation of their "Fondation Riklin" project in Regensdorf, Switzerland January 22, 2021. Picture taken January 22, 2021. REUTERS/Arnd Wiegmann

Swiss concept artists Frank and his twin-brother Patrik Riklin perform during the presentation of their "Fondation Riklin" project in Regensdorf, Switzerland January 22, 2021. Picture taken January 22, 2021. REUTERS/Arnd Wiegmann

Swiss concept artists Frank and his twin-brother Patrik Riklin perform during the presentation of their "Fondation Riklin" project in Regensdorf, Switzerland January 22, 2021. Picture taken January 22, 2021. REUTERS/Arnd Wiegmann

Swiss concept artists Frank and his twin-brother Patrik Riklin pose for a photo during the presentation of their "Fondation Riklin" project in Regensdorf, Switzerland January 22, 2021. Picture taken January 22, 2021. REUTERS/Arnd Wiegmann

Swiss concept artists Frank and his twin-brother Patrik Riklin pose for a photo during the presentation of their "Fondation Riklin" project in Regensdorf, Switzerland January 22, 2021. Picture taken January 22, 2021. REUTERS/Arnd Wiegmann

Monaco's Prince Albert II, his wife Princess Charlene, and their twin children Prince Jacques and Princess Gabriella attend the traditional Sainte Devote celebration in Monaco, 26 January, 2021. Sebastien Nogier/Pool via REUTERS

Monaco's Prince Albert II, his wife Princess Charlene, and their twin children Prince Jacques and Princess Gabriella attend the traditional Sainte Devote celebration in Monaco, 26 January, 2021. Sebastien Nogier/Pool via REUTERS

Monaco's Prince Albert II, his wife Princess Charlene, and their twin children Prince Jacques and Princess Gabriella set fire to a fishing boat during the traditional Sainte Devote celebration in Monaco, 26 January, 2021. Sebastien Nogier/Pool via REUTERS

Monaco's Prince Albert II, his wife Princess Charlene, and their twin children Prince Jacques and Princess Gabriella set fire to a fishing boat during the traditional Sainte Devote celebration in Monaco, 26 January, 2021. Sebastien Nogier/Pool via REUTERS

Prince Albert II, his wife Princess Charlene, and their twin children Prince Jacques and Princess Gabriella set fire to a fishing boat during the traditional Sainte Devote celebration in Monaco, 26 January, 2021. Sebastien Nogier/Pool via REUTERS

Monaco's Prince Albert II, his wife Princess Charlene, and their twin children Prince Jacques and Princess Gabriella set fire to a fishing boat during the traditional Sainte Devote celebration in Monaco, 26 January, 2021. Sebastien Nogier/Pool via REUTERS

An Iraqi security force member checks a man near the damage site in the aftermath of a twin suicide bombing attack in a central market, in Baghdad, Iraq January 22, 2021. REUTERS/Khalid al-Mousily

An Iraqi security force member walks near the damage site in the aftermath of a twin suicide bombing attack in a central market, in Baghdad, Iraq January 22, 2021. REUTERS/Khalid al-Mousily

Members of Iraqi security forces check on people near the damage site in the aftermath of a twin suicide bombing attack in a central market, in Baghdad, Iraq January 22, 2021. REUTERS/Khalid al-Mousily

People inspect the damage site in the aftermath of a twin suicide bombing attack in a central market, in Baghdad, Iraq January 22, 2021. REUTERS/Khalid al-Mousily

People gather at the damaged site in the aftermath of a twin suicide bombing attack in a central market, in Baghdad, Iraq January 22, 2021. REUTERS/Khalid al-Mousily

Mourners gather near the coffin of a man, who was killed in a twin suicide bombing attack in a central Baghdad market, during a funeral in Najaf, Iraq, January 21, 2021. REUTERS/Alaa Al-Marjani

Mourners gather near the coffin of a man, who was killed in a twin suicide bombing attack in a central Baghdad market, during a funeral in Najaf, Iraq, January 21, 2021. REUTERS/Alaa Al-Marjani

Mourners gather near the coffin of a man, who was killed in a twin suicide bombing attack in a central Baghdad market, during a funeral in Najaf, Iraq, January 21, 2021. REUTERS/Alaa Al-Marjani

A man mourns near the coffin of a man, who was killed in a twin suicide bombing attack in a central Baghdad market, during a funeral in Najaf, Iraq, January 21, 2021. REUTERS/Alaa Al-Marjani

Mourners gather near the coffin of a man, who was killed in a twin suicide bombing attack in a central Baghdad market, during a funeral in Najaf, Iraq, January 21, 2021. REUTERS/Alaa Al-Marjani TPX IMAGES OF THE DAY

Mourners gather near the coffin of a man, who was killed in a twin suicide bombing attack in a central Baghdad market, during a funeral in Najaf, Iraq, January 21, 2021. REUTERS/Alaa Al-Marjani

Mourners carry the coffin of a man, who was killed in a twin suicide bombing attack in a central Baghdad market, during a funeral in Najaf, Iraq, January 21, 2021. REUTERS/Alaa Al-Marjani

Mourners carry the coffin of a man, who was killed in a twin suicide bombing attack in a central Baghdad market, during a funeral in Najaf, Iraq, January 21, 2021. REUTERS/Alaa Al-Marjani

A man looks at the covered bodies of people who were killed during a twin suicide bombing attack in a central Baghdad market, at the al-Kindi hospital morgue in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

Women mourn as they walk outside the al-Kindi hospital morgue following a twin suicide bombing attack in a central Baghdad market, in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

A man who was wounded during a twin suicide bombing attack in a central Baghdad market, receives treatment at a hospital in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

Men who were wounded during a twin suicide bombing attack in a central Baghdad market, receive treatment at a hospital in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

A man who was wounded during a twin suicide bombing attack in a central Baghdad market, receives treatment at a hospital in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

A man who was wounded during a twin suicide bombing attack in a central Baghdad market, receives treatment at a hospital in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

An Iraqi security force member stands next to the coffin of a victim of a twin suicide bombing attack in a central Baghdad market, in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

A man who was wounded during a twin suicide bombing attack in a central Baghdad market, receives treatment in a hospital in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

Mourners pray in front of the coffin of a man who was killed in a twin suicide bombing attack in a central Baghdad market, during his funeral at the shrine of Sheikh Abdul Qadir Jeelani in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

Women mourn during the funeral of a man who was killed in a twin suicide bombing attack in a central Baghdad market, at the shrine of Sheikh Abdul Qadir Jeelani in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

Mourners carry the coffin of a man who was killed in a twin suicide bombing attack in a central Baghdad market, during his funeral in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili

Mourners bury a man who was killed in a twin suicide bombing attack in a central Baghdad market, during his funeral in Baghdad, Iraq January 21, 2021. REUTERS/Wissam al-Okaili