If you're interested in licensing this or any other Big Think clip for commercial or private use, contact our licensing partner Executive Interviews: https://www.executiveinterviews.biz/rightsholders/bigthink/ In this excerpt from his Floating University/Great Big Ideas lecture, Dr. Michio Kaku explains that string theory begins where Einstein's framework breaks down. Read more at BigThink.com: http://bigthink.com/videos/michio-kaku-explains-string-theory Follow Big Think here: YouTube: https://www.youtube.com/user/bigthink Facebook: https://www.facebook.com/BigThinkdotcom Twitter: https://twitter.com/bigthink Full lecture: http://www.youtube.com/watch?v=0NbBjNiw4tk