Now think about a cascade of water flowing down those same stairs. The ball and the water behave very differently, and it ...

Free Agents: How Evolution Gave Us Free Will, by Kevin J. Mitchell, Princeton University Press, 352 pages, $29.95 What is free will? Can a being whose brain is made up of physical stuff actually ...

The biggest business trend of the last 50 years has been dematerialization. Creating economic value has become ever less about making, mining, and selling physical stuff, and ever more about ...

In the physical domain of stuff, Kirtly Jones, MD, explores how the accumulation of material goods relates to Maslow's hierarchy of needs. The episode focuses on distinguishing between genuine needs ...