A construction worker wearing a face mask sprays water on a ground before a construction site, following the outbreak of the coronavirus disease (COVID-19), in Beijing, China July 1, 2020. REUTERS/Tingshu Wang

Residents set up makeshift shelter on a raised ground near flood water, after they evacuated from their homes after River Nzoia burst its banks and due to the backflow from Lake Victoria, in Nyadorera, Siaya County, Kenya May 2, 2020. REUTERS/Thomas Mukoya

Mar 13, 2020; Tempe, Arizona, USA; A member of theTempe Diablo Stadium grounds crew waters the infield following the cancellation of spring training games due to concerns over the Covid 19 coronavirus. Mandatory Credit: Joe Camporeale-USA TODAY Sports

Feb 25, 2020; West Palm Beach, Florida, USA; A member of the FITTTEAM Ballpark grounds crew waters the field prior to the start of a spring training game between the Miami Marlins and the Houston Astros at FITTEAM Ballpark of the Palm Beaches. Mandatory Credit: Rhona Wise-USA TODAY Sports

Feb 14, 2020; Mesa, AZ, USA; A grounds crew member waters the field during a Chicago Cubs spring training workout at Sloan Park. Mandatory Credit: Matt Kartozian-USA TODAY Sports

Cricket - South Africa v England - Second ODI - Kingsmead Cricket Ground, Durban, South Africa - February 7, 2020 General view of water on the field as rain stops play REUTERS/Rogan Ward

Kamikia, from Kisedje tribe poses for a picture during a four-day pow wow in Piaracu village, in Xingu Indigenous Park, near Sao Jose do Xingu, Mato Grosso state, Brazil, January 15, 2020. Picture taken January 15, 2020. When asked what the importance of nature would be or what they expect for the future of their people, said: "Nature is everything to me, it's life. Because she is the one who makes the rain that water the ground". REUTERS/Ricardo Moraes

A dead red-tailed monkey hangs by its tail above the ground, in order to keep it away from ants, in the forest near the city of Mbandaka, Democratic Republic of the Congo, April 5, 2019. Reuters Photographer Thomas Nicolon: "I slept overnight with the poachers in the forest. The sun had risen above the canopy, there was still fog over the river and the hunters packing their dugout canoes ready to leave. That day we would go back to the city of Mbandaka after spending four days in the rainforest hunting bushmeat. The monkey that had been killed the day before was hanging from a tree above the water, in order to prevent ants from eating it. Its baby had been crying all night. They would eat it a few hours later. I grabbed my camera and got closer to the dead monkey. I wanted to show the crude reality of hunting. Hours earlier the monkey was swinging from branch to branch, high up in the trees, a symbol of CongoÕs rich biodiversity. But by morning it was just flesh. It had been disemboweled, and it was now a symbol of Congo's empty forests." REUTERS/Thomas Nicolon/File Photo SEARCH "POY STORIES 2019" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY

A demonstrator lies on the ground as he tries with other demonstrators to stop a police water cannon truck during a protest against Chile's government in Santiago, Chile November 29, 2019. REUTERS/Goran Tomasevic

The source chamber containing violet shining argon plasma is seen at the laboratory of the ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

The beam-imaging chamber to take pictures of the atoms is seen at the laboratory of the ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

The end of the Zeeman-slower and the magneto-optical trap to catch and count the atoms, are seen at the laboratory of the ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Markus Oberthaler, head of the ArTTA Atom Trap Trace Analysis working group, poses next to the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

PhD student of Physics Lisa Ringena controls the optics of the laser system of the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Markus Oberthaler, head of the ArTTA Atom Trap Trace Analysis working group, poses next to the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

PhD students of Physics Maximilian Schmidt, Lisa Ringena and Julian Robertz transfer liquid nitrogen to a storage barrel at the laboratory of the ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Arne Kersting, member of the ArTTA working group, operates the Argon-Preparation-System in a laboratory at the Institute of Environmental Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

The source chamber containing violet shining argon plasma is seen at the laboratory of the ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

A student controls the source chamber containing violet shining argon plasma and a collimator at the laboratory of ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

PhD student of Physics Lisa Ringena controls parameters as she looks at the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

The source chamber containing violet shining argon plasma is seen at the laboratory of the ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

PhD students of Physics Maximilian Schmidt and Julian Robertz lock the master laser to the argon frequency wavelength of the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

PhD student of Physics Maximilian Schmidt, controls parameters as he looks at the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

A student aligns a mirror to obtain an optimal signal next to a faraday isolator and a tapered amplifier of the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

PhD student of Physics Lisa Ringena controls the optics of the laser system of the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Markus Oberthaler, head of the ArTTA Atom Trap Trace Analysis working group, poses next to the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Markus Oberthaler, head of the ArTTA Atom Trap Trace Analysis working group, poses next to the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Markus Oberthaler, head of the ArTTA Atom Trap Trace Analysis working group, poses next to the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Arne Kersting, member of the ArTTA working group, prepares a block of ice, a probe from Austria's Schaufelferner, for the Argon-Preparation-System at the Institute of Environmental Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Arne Kersting, member of the ArTTA working group, opens a probe container after the extraction of argon with the Argon-Preparation-System in a laboratory at the Institute of Environmental Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

A member of the ArTTA working group, prepares a block of ice, a probe from Austria's Schaufelferner, for the Argon-Preparation-System at the Institute of Environmental Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Werner Aeschbach, head of the ArTTA Atom Trap Trace Analysis working group, poses next to the Argon-Preparation-System in a laboratory at the Institute of Environmental Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

A polarizing beamsplitter cub and a half-wave plate are demonstrated with the ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Werner Aeschbach, head of the ArTTA Atom Trap Trace Analysis working group, poses next to the Argon-Preparation-System in a laboratory at the Institute of Environmental Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

The centerpiece of an ArTTA Atom Trap Trace Analysis system is seen at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

An infrared laser, made visible by vapour, is split by a birefringent crystal into one vertical and one horizontal beam, demonstrated with an ArTTA Atom Trap Trace Analysis system currently at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

A spectroscopy cell, an iris, a polarizing beamsplitter cube and a photodiode are demonstrated with an ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

The centerpiece of an ArTTA Atom Trap Trace Analysis system is seen at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

An infrared laser, made visible by vapour, is split by a birefringent crystal into one vertical and one horizontal beam, demonstrated with an ArTTA Atom Trap Trace Analysis system currently at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Polarizing beamsplitter cubes and half-wave plates are demonstrated with the ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Steel containers with probes of argon gas wait for dating with the ArTTA Atom Trap Trace Analysis system for 39Ar in the laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

PhD students of Physics Maximilian Schmidt, Lisa Ringena and Julian Robertz work at the laboratory of the ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

A polarizing beamsplitter cub and a half-wave plate are demonstrated with the ArTTA Atom Trap Trace Analysis system at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 7, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

PhD students of Physics Julian Robertz and Maximilian Schmidt discuss about results of the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

Arne Kersting, member of the ArTTA working group, operates the Argon-Preparation-System in a laboratory at the Institute of Environmental Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

PhD students of Physics Maximilian Schmidt and Julian Robertz adjust the frequency of a laser beam of the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

A member of the ArTTA working group fills up nitrogen during the extraction of argon with the Argon-Preparation-System in a laboratory at the Institute of Environmental Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

A computer monitor displays the detection program interpreting the signal of the avalanche photodiode APD of the Atom Trap Trace Analysis system at the ArTTA laboratory at the Kirchhoff-Institute for Physics in Heidelberg, Germany, December 6, 2018. Atom Trap Trace Analysis for 39Ar is an ultra-sensitive detection method based on principles of quantum mechanics and found its first application in dating ground water and ice samples. REUTERS/Lisi Niesner

A demonstrator dives to the ground from a water cannon during a protest against Chile's government in Santiago, Chile November 11, 2019. REUTERS/Ivan Alvarado TPX IMAGES OF THE DAY

Oct 26, 2019; Washington, DC, USA; The grounds crew waters the field before game four of the 2019 World Series between the Houston Astros and the Washington Nationals at Nationals Park. Mandatory Credit: Tommy Gilligan-USA TODAY Sports

A pipe with a bottle attached to the end is seen outside a house in Aurangabad, India, August 2, 2019. REUTERS/Francis Mascarenhas

Oct 4, 2019; Atlanta, GA, USA; The ground crew waters the infield prior to game two of the 2019 NLDS playoff baseball series between the Atlanta Braves and the St. Louis Cardinals at SunTrust Park. Mandatory Credit: Brett Davis-USA TODAY Sports

Canals are pictured among burnt land after a forest fire near Banjarmasin in South Kalimantan province, Indonesia, September 29, 2019. REUTERS/Willy Kurniawan REFILE - CORRECTING NAME OF THE PROVINCE

Sep 27, 2019; Chicago, IL, USA; Chicago White Sox grounds crew members push water off of tarps before game one of a baseball doubleheader against the Detroit Tigers at Guaranteed Rate Field. Mandatory Credit: Matt Marton-USA TODAY Sports

Sep 27, 2019; Chicago, IL, USA; Chicago White Sox grounds crew members push water off of tarps before game one of a baseball doubleheader against the Detroit Tigers at Guaranteed Rate Field. Mandatory Credit: Matt Marton-USA TODAY Sports

Sep 27, 2019; Chicago, IL, USA; Chicago White Sox grounds crew members push water off of tarps before game one of a baseball doubleheader against the Detroit Tigers at Guaranteed Rate Field. Mandatory Credit: Matt Marton-USA TODAY Sports

Sep 27, 2019; Chicago, IL, USA; Chicago White Sox grounds crew members push water off of tarps before game one of a baseball doubleheader against the Detroit Tigers at Guaranteed Rate Field. Mandatory Credit: Matt Marton-USA TODAY Sports

Sep 27, 2019; Chicago, IL, USA; Chicago White Sox grounds crew members push water off of tarps before game one of a baseball doubleheader against the Detroit Tigers at Guaranteed Rate Field. Mandatory Credit: Matt Marton-USA TODAY Sports

Sep 27, 2019; Chicago, IL, USA; Chicago White Sox grounds crew members push water off of tarps before game one of a baseball doubleheader against the Detroit Tigers at Guaranteed Rate Field. Mandatory Credit: Matt Marton-USA TODAY Sports

A boat ramp leads to the drought-affected Split Rock Dam near Tamworth in rural Australia September 23, 2019. Picture taken September 23, 2019. REUTERS/Jonathan Barrett