This week on Sierra Club Radio:
Our host Orli Cotel is back! And now recording new shows...
- Astrophysicist Roberto Trotta talks with us about his book, The Edge of the Sky, which explains the history of the universe using only the 1,000 most common words in the English language
- Peter Martin, Executive Director of the Sierra Club Foundation, on why he's running the Boston Marathon to raise money for Sierra Club Outdoors