A fascinating look at an early sf author: Meet Lady Margaret Cavendish. BY NATALIE ZARRELLI SEPTEMBER 16, 2016 Margaret Cavendish, the Duchess of Newcastle. (Photo: Public Domain) NO ONE COULD GET INTO philosophical argument with Lady Margaret Cavendish, Duchess of Newcastle-upon-Tyne, and walk away unchanged. Born in 1623, Cavendish was an outspoken aristocrat who traveled in circles of…