To retire from retirement.
Be careful when you oreder this or any other book for Amazon Kindle PC. I had this reader installed on my PC but registered to an old email address. I could not load the book to it as I am now registered with g mail. The only way was to de-register and lose the books I already had and then re-register under the new email address and then only my new order would appear.
Needless to say I have returned the book for refund.