Recently I bought a text book for my study, and it had a typo. so I send an email to the authors about that and hoped to be corrected after. After sending my email, I got an instant and automatic reply from one of the authors, former professor of stanford university. That said He already passed away Aug, 2004 and it indicated two more email address for the case I need to contact more.

Alas, It’s not a pleasant feeling to receive an email from who already died but I believed to exist in this world.