Alan Guth talks about the concept of entropy, its relationship to information, and the arrow of time in systems governed by time-reversible physical laws.

Explore more:

• Alan Guth, "Infinite Phase Space and the Two-Headed Arrow of Time"
• More from Mind Matter Conference in Tuscany, with Sean Carroll on Causality and the Arrow of Time
• The Quantum State of the Universe - A Dialogue with Sean Carroll and Alan Guth: Sean Carroll and Alan Guth discuss the quantum state of the universe.