Dr. Kaku talked about how his work is defined in "hyperspace" and higher dimensions, and how the cosmic questions physicists deal with often border on "reading the mind of God." "We want a one-inch equation that can explain everything from the Big Bang to the creation of life and the Universe as we know it," said Dr. Kaku, who noted that Albert Einstein had sought a similar equation.
Colbert also asked Dr. Kaku about time travel, wondering (as Stephen Hawking has) why haven't we met anyone from the future who has traveled to our time. Dr. Kaku suggested that future travelers might be among us, wearing Harry Potter-style invisibility cloaks.
Dr. Kaku's recent posts for Big Think have focused on whether learning from nature might help us create a "replicator" in a lab; why physicists "are the only scientists who can say the word 'God' and not blush"; and the basics of string theory.