Writer Benjamin Kunkel bookmarks Herman Daly's "Steady-State Economics."
Edmund Morris says Theodore Roosevelt was a force of nature - man of towering intellect, boundless physical energy and firm convictions whose greatest achievement as President was his commitment to conservation.
In his book "Back to Our Future" David Sirota says the proof is in the staying power of 80s pop culture.
Colum McCann tells Steve Paulson what made Rudolf Nureyev the greatest dancer of his time and that his life was shaped by his ambition and his physical beauty.
Daniel Dennett is one of the leading advocates of evolutionary theory and a fierce critic of creationism.
If human beings are part neanderthal, Brian Fagan tells Jim Fleming the rest of us is something else - Cro-Magnon.
DEVO co-founder Mark Mothersbaugh talks about his new visual art exhibition, "Myopia."
The documentary, "Examined Life," features eight prominent philosophers, including Cornel West, Peter Singer, Slavoj Zizek and Judith Butler.