Videos

Interview on The Colbert Report.

Explaining time's arrow at TEDxCaltech.

The Origin of the Universe and the Arrow of Time, an introduction to the arrow of time and its cosmological origin, at the Quantum to Cosmos Festival in October 2009. Longer version of the previous talk, essentially.

A conversation with Roger Bingham for the Science Network.

A short video I made to explain Stephen Hawking's controversial quote about God.

An excerpt from LOST University -- The Physics of Time Travel.

Beyond Belief 2006, a short (17 minutes) rumination on laws, reductionism, and causality.

From Eternity to Here: a video trailer for the book.

The Paradoxes of Time Travel, a popular talk at Linda Hall Library, Kansas City.

A clip from National Geographic's Known Universe.

The Invisible Universe: Dark Matter and Dark Energy, a talk at the Google outpost in Santa Monica.

Dark Matter and Dark Energy, a short talk at the Yearly Kos convention in 2007. Slides available in html and in pdf.

Dark Energy, or Worse?, a Distinguished Lecture at the National Science Foundation about whether we can replace dark matter and dark energy by modified gravity. (Probably not, but it's not completely clear.) Here is the pdf.