Booksellers claim to have found Shakespeare’s annotated dictionary: this one is hard to believe. 1) did he provably own a copy of that book? 2) did he write in the margins of other books he owned? 3) are the marks consistent with other margin-writers of his day (if people actually did it that long ago)? The underlining, to me, seems modern—not twentieth-century or anything but at least eighteenth. They have a book documenting their discovery and making the case, as well as original scans on their site.