The ability appears to be innate for members of the Heterodyne family, and in fact was the most obvious [ sign] [[Chronology - Volume #|✣ ]] of Agatha Heterodyne's imminent breakthrough. However, it can also be reproduced [ mechanically] [[Chronology - Volume #|✣ ]], and might be [ imitable from memory.] [[Chronology - Volume #|✣ ]] This is a strong indicator to the people of Mechanicsburg that someone 'claiming' to be a Heterodyne is genuine, and many of them really need to be convinced of it.