What year did byron de la beckwith get tried and convicted for the murder of medgar evers

Who did the first work in creating vaccines

The threat of foreign intervention to restore louis xvi to the throne caused the french revolution to ?

Which stanza structure does emily dickinson use in this excerpt from "hope is the thing with feathers"? hope is the thing with feathers that perches in the soul, and sings the tune without the words, and never stops at all, and sweetest in the gale is heard, and sore must be the storm that could abash the little bird that kept so many warm.