Brain-on-a-chip. Dazzling in green and magenta this image shows the nerve fibres (in green) produced by neural stem cells (in magenta) as they grow on a synthetic gel. Captured by a technique known as confocal microscopy, the image is part of research shedding light on how tinkering with the environment can affect the way in which nerve fibres grow. (Photo by Collin Edington and Iris Lee/Massachusetts Institute of Technology/Wellcome Images)

Children feed a giraffe at Pairi Daiza wildlife park, a zoo and botanical garden in Brugelette, Belgium, May 25, 2015. (Photo by Francois Lenoir/Reuters)

Photographer Dotan Saguy visited Cuba expecting to find resentment toward Americans, but he says that, instead, “Every Cuban I met was warm and welcoming despite me being an American”. Here: Several groups of locals relax on the Malecon in Old Havana, Cuba May 1, 2016. Some chat and drink rum while others dive into the warm Caribbean Sea. (Photo by Dotan Saguy)

Devotees throw flower petals on an idol of the Hindu god Ganesh, the deity of prosperity, on the occasion of his birthday, celebrated as Magha Ganesh Jayanti, before immersing the idol into the Arabian sea, in Mumbai, India on February 16, 2021. (Photo by Francis Mascarenhas/Reuters)

A pack of wild smooth-coated otters, nicknamed the “Zouk family”, crosses Penang Road in Singapore on March 3, 2021, the World Wildlife Day. The “Zouks”, a well-known otter family in Singapore, started out from the Istana on Wednesday, and made a “royal” tour of various landmarks in Singapore. (Photo by Chine Nouvelle/SIPA Press/Rex Features/Shutterstock)

Savita, a street performer, helps her dog to balance on empty tin containers as they perform at a roadside in Ahmedabad September 7, 2014. (Photo by Amit Dave/Reuters)

A dog waits to be blessed by a priest outside San Anton Church in Mijas, near Malaga, Spain, January 17, 2017. Hundreds of pet owners bring their animals to be blessed every year on the day of Saint Anthony, Spain's patron saint of animals. (Photo by Jon Nazca/Reuters)

Camels graze in front of a spacecraft tracking station ahead of the Soyuz MS-10 upcoming launch at the Baikonur Cosmodrome, Kazakhstan, October 9, 2018. (Photo by Shamil Zhumatov/Reuters)