Harry Harrison died this morning. He was the author of (among others) the Deathworld trilogy, The Stainless Steel Rat series, and Make Room! Make Room!
I never met him, but I read his books. My favourites? Deathworld 1 and 3. And of those two, probably the latter. It taught me the uses of history and the remorselessness of cultural change. All that and swords and ponies. I loved it. I would like to have met him and told him so.
In his memory, I think it would be a fine thing for all of us to go read a book we love and then tell its author why.