(Minghui.org) Twenty years ago this May, Master Li Hongzhi introduced Falun Dafa to the public in Changchun, China. Falun Dafa has since spread around the world. An estimated more than 100 million practitioners have been following the principles of Truth-Compassion-Forbearance and have benefited in both mind and body. For the past thirteen years, every May 13, Falun Dafa practitioners around the world have sent greeting cards to Minghui.org to celebrate World Falun Dafa Day and wish revered Master a happy birthday. The following are some of the greeting cards selected this year for publication.