Three workers demonstrating the different types of gas masks used in mine rescue work. (Photo by Fox Photos/Getty Images). December 1925

A man walks through the morning mist in a park in Rozzano, near Milan, northern Italy, Thursday, December 17, 2015. (Photo by Antonio Calanni/AP Photo)

An aircraft passes over houses at it lands at Heathrow Airport near London, Britain, December 11, 2015. Picture taken December 11, 2015. (Photo by Neil Hall/Reuters)

The tempestuous stellar nursery called the Carina Nebula, located 7,500 light-years away from Earth in the southern constellation Carina. (Photo by Reuters/NASA)

In this image released on December 09, English model Leomie Anderson and English model and actress Jourdan Dunn attend the 2020 MOBO Awards held at Exhibition London on December 07, 2020 in London, England. The MOBO Awards will be live-streamed on YouTube at 7pm and broadcast on BBC One at 10.45pm. (Photo by Michael Tubes/MOBO Organisation/Rex Features/Shutterstock)

Cuban-American singer Camila Cabello arrives at iHeartRadio's Z100 Jingle Ball 2019 at Madison Square Garden on December 13, 2019 in New York City. (Photo by Michael Loccisano/Getty Images)

Rihanna attends the Balmain show as part of the Paris Fashion Week Womenswear Fall/Winter 2014-2015 on February 27, 2014 in Paris, France. (Photo by Dennis Leupold/The Guardian)

Secondary school graduates play in a fountain as they celebrate the last day of school, traditionally called the “last bell” in central Kiev, Ukraine on May 31, 2019. (Photo by Valentyn Ogirenko/Reuters)