AIDS is not contagious, but love is. I was deeply moved when I first saw this video. When I Googled "FREE HUGS," there were 630,000 search results. The first one was an article by Sang Linzhi. I found that his video from the busy streets of Sydney, Australia, was not as impactful as the video I saw from the streets of Paris, France, so I posted it. However, Sang Linzhi's introduction is more comprehensive, so it is more appropriate to reproduce the entire text.