Come with us to Chaco Canyon in northwestern New Mexico, which is rich with thousand-year-old artifacts of the ancient Pueblo culture and contains sites that appear to have been astronomical observatories.
In 2009, the ECHO (Education through Cultural and Historical Organizations) Partners hosted a national symposium held at the Exploratorium to discuss the effects of climate change on the planet. You can watch archived webcasts of the symposium.
This special online-only edition of Exploring takes a closer look at the sweet lure of chocolate. We'll examine the fascinating -- and often misreported -- history of chocolate, follow the chocolate-making process, and take an online visit to a chocolate factory.