Thai Crown Prince Maha Vajiralongkorn rides his bicycle as he takes part in a campaign "Bike for Mom" to celebrate the role of his elderly mother Queen Sirikit in Bangkok on August 16, 2015. Thailand's Crown Prince led tens of thousands of blue-clad cyclists through Bangkok in a rare high-profile public appearance amid anxiety over the health of the ailing king. AFP PHOTO / PORNCHAI KITTIWONGSAKUL (Photo credit should read PORNCHAI KITTIWONGSAKUL/AFP/Getty Images)
