Question: I don't remember which episode this is but it's the one where at the end Iroh gets out a picture of his son and some incense and tells his deceased son happy birthday. Then at the end, where it's over in the top right-hand corner of the screen, it reads, "In Memory Of Mako" or something along those lines. Who's Mako? I thought his son was Lu Ten.
Answer: Mako Iwamatsu, often credited simply as "Mako" was the actor who voiced Iroh during the first two season of the show - he died of cancer in July 2006.
Chosen answer: Toph had Katara use it to send a letter to her parents. It never returned.