Robert Fuller is the author of "Wonder" - the first in-depth look at one of humanity's most important emotions.
Intelligent. Optimistic. Curious.
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Lawrence Krauss isn't only a famous physicist; he's also the subject, along with Richard Dawkins, of the documentary film "The Unbelievers." He tells Steve Paulson that science has replaced philosophy and religion as the place to deal with the Big Questions.
Three physicists just won the Nobel Prize for their discovery that the universe is rapidly expanding.
Many people don't know that the voice of Bart Simpson is really Nancy Cartwright. She started doing voices in her early teens, and credits Daws Butler with teaching her to be an actor with her voice.
Australian Les Murray is considered by many literary critics to be the greatest living poet in English today.
So, what is gender anyhow? Philosopher Judith Butler has been unpacking our notions of "he," "she" and "we" for the past 20 years. She stopped in to help us take stock of the state of gender in the North America.
Lupe Fiasco is a devout Muslim whose album "Food and Liquor" went to number one of the rap album charts and won three Grammy Nominations.
Plant biologist Nicholas Harberd took a year off to study a common weed - the thalecress - that he found growing in a country churchyard.
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