Pseudoscience is a set of theories, methods, and assumptions that appear scientific, but aren’t. In the worst cases, pseudoscience practitioners encourage this confusion to exploit people. But even when it's well-intentioned, pseudoscience can still prevent people from getting the help they need. So, how can you tell what’s science and what’s pseudoscience? Siska De Baerdemaeker investigates. Lesson by Siska De Baerdemaeker, directed by Eoin Duffy.