Farnsworth's grandmother

Farnsworth's grandmother is an unseen character who has been mentioned various times throughout the series. It's unlikely that she was a role model to her grandson, because the Professor doesn't speak of her when he's telling Fry about the great minds that have inspired him all his life in "The Duh-Vinci Code". Nevertheless, it's possible that she was a scientist, as some of "his inventions" actually belonged to her (such as the Diamond-Filament Tether).

Trivia

 * She's probably deceased, considering the Professor is 0 years old.
 * It isn't confirmed if both grandmothers referenced are the same person.