Which spice is derived from dried inner bark of trees?

Cinnamon

In which animated series does the character Po the panda appear as the main hero? Which pop band had hits like "Butter", "Dynamite", and "Permission to Dance"? Which traditional Halloween symbol can witches and vampires famously not see their reflection in? Who was president of the United States during the Louisiana Purchase? What NFL franchise was originally known as the Boston Braves?