Coloured X-ray of a barn owl. A physicist has used X-ray to create an extraordinary collection of artwork. Arie van't Riets pictures reveal birds, fish, monkeys and flowers in an incredible new light. The 66-year-old, from Bathmen in the Netherlands, began X-raying flowers as a means to teach radiographers and physicians how the machine worked. But after adding a bit of colour to the pictures, the retired medical physicist realised the potential for an exciting new collection of art. (Photo by Arie van't Riet/Barcroft Media)

An Indian white tiger cools off in a pond in its enclosure at Chhat Bir Zoo on the outskirts of Chandigarh on May 22, 2016. Temperatures have soared to a scorching 51 degrees Celsius in one Indian city, meteorologists said, with the ferocious heat setting a new national record. Northern Phalodi wilted as the mercury reached a new high on May 20, equivalent to 123.8 Fahrenheit, beating a 60-year-old record. (Photo by Shammi Mehra/AFP Photo)

Though schools around the globe have different start dates, calendars and traditions, the first day of a new term is an exciting time filled with the prospects of gaining more knowledge, making new friends and building community. Here: Schoolchildren attend their first lesson on Knowledge Day in the town of Turov, Zhytkavichy District, Gomel Region, Belarus on September 1, 2017. Knowledge Day marks the beginning of a new school year in Belarus and is celebrated on September 1. (Photo by Viktor Drachev/TASS via Getty Images)

Iraqi Kurds carry fire torches as they celebrate Nowruz Day, a festival marking the first day of spring, Kurdish and Persian New Year in Akre, Iraq on March 20, 2024. Newroz or Nowruz means “new day” in Persian, and is celebrated to mark the arrival of spring and the first day of the Iranian calendar. It is widely celebrated in Persian and neighboring regions and is recognized on UNESCO's Intangible Cultural Heritage of Human List. (Photo by Ismael Adnan/SOPA Images/Rex Features/Shutterstock)

Yoga practitioners participate in yoga classes inside Times Square on the day of the summer solstice in New York City on June 20, 2024. The annual all-day outdoor yoga event, which is in its 22nd year, features classes from sun up to sun down in one of the busiest intersections of the world. (Photo by Andrew Schwartz/Splash News and Pictures)

Burlesque performer Tallulah Talons dances in the “Pandemic Burlesque” show presented by Tallulah Talons at Club Cumming on March 18, 2021 in New York City. Like many other New York City nightlife venues, the club was shuttered in March 2020 due to the Covid-19 pandemic, but it continued to host cabaret and comedy shows via live stream for most of the year. The venue reintroduced on-site outdoor events in late December 2020. (Photo by Angela Weiss/AFP Photo)

People wear face masks while participating in the annual Memorial Day Parade on May 25, 2020 in the Staten Island borough of New York City. Dozens of cars and nearly 100 members of the patriotic motorcycle group Rolling Thunder joined the event. This year’s parade was diminished in size and in person-to-person contact due to the coronavirus outbreak. Across the country, events honoring the nation’s veterans have been cancelled or scaled back as America continues to experience high numbers of deaths and new cases of COVID-19. (Photo by Spencer Platt/Getty Images)

A woman raises her fist during events to mark Juneteenth, which commemorates the end of slavery in Texas, two years after the 1863 Emancipation Proclamation freed slaves elsewhere in the United States, amid nationwide protests against racial inequality, in the Harlem neighbourhood of Manhattan, in New York City, New York, June 19, 2020. (Photo by Andrew Kelly/Reuters)