People play Taiji on a square on August 08, 2011 in Luoyang, Henan Province of China. People all over China mark National Fitness Day on Monday in their own ways. (Photo by ChinaFotoPress/Getty Images)

A Maasai boy bites a bull's heart during an initiation into an age group ceremony near the town of Bisil, Kajiado county, Kenya, August 23, 2018. Thousands of Kenyan boys had a blessing of milk and beer sprayed on them as part of a rare Maasai ethnic community initiation ceremony to mark their passing into early manhood. (Photo by Baz Ratner/Reuters)

Tourists from Holland peak through a crack in a still-existing portion of the Berlin Wall at the main memorial to the Wall in Bernauer Strasse on the 22nd anniversary of the fall of the Wall on November 9, 2011 in Berlin, Germany. The Berlin Wall, erected by the communist authorities of then East Germany in 1961, divided the city and prevented East Germans from travelling west until the collapse of the Eastern Bloc in 1989. (Photo by Sean Gallup/Getty Images)

A Utah Valley University student walks down the bright green lanes painted on the stairs from the gym Thursday, June 18, 2015, at Utah Valley University, in Orem, Utah. Utah Valley University spokeswoman Melinda Colton said the green lanes were intended as a lighthearted way to brighten up the space and get students attention. (AP Photo/Rick Bowmer)

A Palestinian demonstrator jumps in the air during clashes with Israeli riot police on May 13, 2011 in the East Jerusalem neighbourhood of Issawiya, Israel. Palestinians began marking the “Nakba” or “catastrophe” which befell them following Israel's establishment in 1948. (Photo by Uriel Sinai/Getty Images)

Madison Sager (L), Jocelyn Sager and Susan Ihry (C) make their way through the West Acres Mall JCPenney store after 3 a.m. on November 25, 2011 in Fargo, North Dakota. The trio began shopping at 10 p.m. the night before at Walmart. (Photo by Chris Franz/Getty Images)

A Pakistani feeds his goat wearing the words “Eid Mubarak” or “Eid Greeting”, to be slaughtered on the Muslim holiday of Eid al-Adha, or “Feast of Sacrifice”, in Islamabad, Pakistan on Tuesday, October 15, 2013. Muslims all over the world are celebrating Eid al-Adha by sacrificing sheep, goats, cows and camels, to commemorate the Prophet Abraham's readiness to sacrifice his son, Ismail, on God's command. (Photo by Anjum Naveed/AP Photo)