In 2007, Hawking and his daughter Lucy published George's Secret Key to the Universe, a children's book designed to explain theoretical physics in an accessible fashion and featuring characters similar to those in the Hawking family.
Tahun 2007, Hawking bersama putrinya, Lucy, menerbitkan George's Secret Key to the Universe, buku anak-anak yang menjelaskan fisika teoretis secara sederhana dan menampilkan tokoh-tokoh yang mirip dengan keluarga Hawking.