Their volumes contain information on subjects such as quotes, dumb criminals, palindromes, anagrams, urban legends and hoaxes, failed inventions, the history of everyday things, and accidental discoveries, as well as articles on pop culture and 'celebrities' such as Emperor Norton (see Features). Throughout the books, there are what the BRI calls "running feet"—short fun facts on the bottom of each page. A typical example is "An object on Jupiter would weigh 144,000 times more than it would on Pluto." Some books have one running foot that simply says "Hi, mom."