"It’s for people like Roberts that Dr. Matthew Bromwich, who practises pediatric otolaryngology at the Children’s Hospital of Eastern Ontario, invented the DizzyFix—a curved tube containing a small green ball floating in oil, attached to a baseball cap. Wearing the cap, the BPPV patient goes through a sequence of movements that send the ball along a specific path in the tube—and also guide the crystal debris out of the semicircular canals.