A woman swims in a partially frozen lake at a park in Shenyang, China. | (REUTERS/Sheng Li)

Palestinian girls take a ballet class in Gaza City. | (REUTERS/Suhaib Salem)

A green vine snake feeds on an Indian Forest Skink inside the Silent Valley national park in Kerala, India. | (REUTERS/Abhishek N. Chinnappa)

New recruits for the People's Liberation Army stand in formation during a training session in cold winter temperatures at a military base in Heihe, China. Temperatures reached four degrees below zero Fahrenheit. | (REUTERS/China Daily)

Refugees covered with blankets wait to be allowed to cross the Macedonian border in northern Greece. | (AP Photo/Petros Giannakouris)

Swimmers warm up during the U.S. Winter Nationals swimming event in Federal Way, Washington. | (AP Photo/Elaine Thompson)

Men put on storm trooper costumes in the parking lot of the "For The Love of The Force" Star Wars fan convention in Manchester, England. | (REUTERS/Phil Noble)

Pairs of shoes are symbolically placed on the Place de la Republique, after the cancelation of a planned climate march following shootings in the French capital, ahead of the World Climate Change Conference 2015 (COP21), in Paris. | (REUTERS/Eric Gaillard)

History enthusiasts dressed as soldiers march near the village of Herspice, Czech Republic, marking the 210th anniversary of Napoleon's famous battle of Austerlitz. | (REUTERS/David W Cerny)

A Japanese macaque jumps between rocks at a hot spring in Yamanouchi, Japan. | (REUTERS/Yuya Shino)

Hundreds of people ride indoor bicycles during a campaign to promote exercising in Kunming, China. | (REUTERS/Wong Campion)

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