Every year a memorial lecture is held in honor of English writer Douglas Adams, author of The Hitchhiker’s Guide to the Galaxy, to benefit the animal conservation group Save the Rhinos. This year one of the topics of the lecture is “The Science of Harry Potter,” presented by Roger Highfield, author of “Can Reindeers Fly?” and “Super Cooperators.” The lecture touches on such items as Floo Powder, Dragons and the Invisibility Cloak among others.

Watch closely, and you’ll see the Hogwarts headmaster making a cameo appearance in Warner Bros.’ new film, The Lego Movie! Writer and Director Chris Miller reveals to The Hollywood Reporter how difficult it was to secure the legal rights to use the beloved wizard.