(Mental Floss) -- Former British Prime Minister Tony Blair's memoir, "A Journey," is sparking all sorts of picketing and protesting around the U.K., so we thought it might be a good time to take a look at a few presidential memoirs from this side of the pond. Here are a few things you might not have known about former presidents' literary output. Best choice of (possible) ghostwriter Ulysses S. Grant should have been on sound financial footing when he finished his second term in 1877. He was arguably the world's most famous war hero, and he had been in the White House for eight years.
@highlight
"A Journey," Tony Blair's memoir, is causing protesting around the UK
@highlight
The memoirs of Betty Ford and Nancy Reagan outsold those of their husbands
@highlight
Many suspect that the "Personal Memoirs of Ulysses S. Grant" was written by Mark Twain
Mark Twain approached @placeholder about publishing the war hero's memoirs with a plum deal that would give Grant 75 percent of the profits as royalties.