Celebrate Earth Day by considering the ways you can address climate change at home, with practical advice from a scientist who's seen its effects around the world. Then hear from a culinary historian about the crops, farm animals, and agricultural traditions that we risk losing in America. And mark Shakespeare's birthday by learning how his works have played a key role in shaping Africa's newest nation and by getting tips for enjoying a visit to his hometown of Stratford-upon-Avon.