Yesterday marked the 20th anniversary of the Tiananmen Square massacre . Today, The Big Picture , the Globe's photo blog, put up a touching remembrance . The changes—the disconnect, the growth—between these two pictures, 1989 and today, are striking: Changan Avenue, near Tiananmen Square, 1989 Changan Avenue, near Tiananmen Square, 2009 When I was last in China , my blog was blocked by the great firewall. That's me, a rabble rouser. I rouse rabble.