From the outdated Presidential Fitness Test to today's FITNESSGRAM, Americans have been giving standardized fitness tests to middle school kids for decades. Learn the past and present of these exams in today's episode of BrainStuff.
Why are some politicians so eager for large businesses to set up shop in their districts? What are those businesses' real motivations in making selections? Learn what some researchers think about corporate megadeals in this episode of BrainStuff.
The Inca never developed a system of writing, but they kept records and told stories through intricate knotwork. Learn what researchers know -- and what they're still looking to find out -- about Inca khipu in this episode of BrainStuff.