Flat Earthers are hijacking a valid viewpoint made by this former schoolteacher in their favor. As most flat Earthers are racist and this woman is a staunch anti-racist, she’d be very unhappy to know this. The “grandma” is Jane Elliott, a schoolteacher who famously conducted a brown eyes/blue eyes experiment to teach her (white) class what it felt to be racially discriminated. See video below. Her point about the Mercator map is that it helped European colonizers advance racism. They loved the M

Minimization of Boolean function using k-map