The compilation Billions and Billions : Thoughts on Life and Death at the End of the Millennium , published after Sagan 's death , contains essays written by Sagan , such as his views on abortion , and Ann Druyan 's account of his death as a non-believer .
The compilation Billions and Billions : Thoughts on Life and Death at the Brink of the Millennium , published in 1997 after Sagan 's death , contains essays written by Sagan , such as his views on abortion , and his widow Ann Druyan 's account of his death as a skeptic , agnostic , and freethinker .