The Tianxin Pavilion is illuminated with blue colored lights to raise awareness about Autism Spectrum Disorder (ASD) in Changsha, capital of central China's Hunan Province, April 2, 2019, the World Autism Awareness Day. World Autism Awareness Day on April 2 every year is designated to encourage member states of the United Nations to take measures to raise awareness about people with ASD throughout the world. (Xinhua/Xue Yuge)