Britannica says which author's 1852 novel helped harden both pro- and antislavery feeling?

Britain's first cat show, in 1871, included black, blue and white types of which long-haired breed? Britain's longest trial ended in 1997 with two activists found guilty of libeling which fast-food company? Britain's most popular silent film star shared her last name with a 1917 declaration. Who was she? Which French author wrote the 1880 novel "Nana", part of his Rougon-Macquart cycle? British Airways retired its fleet of which supersonic jet in 2003? British Army Captain Thomas Preston was tried and acquitted for his part in which 1770 slaughter? Which British novelist, author of "Mrs Dalloway", was a central figure in the Bloomsbury Group? In 1803, English chemist Smithson Tennant discovered osmium and which other element?