You're reading a wrap-up of the Sept. 22 Republican presidential debate when you land on this claim from Rep. Michele Bachmann: "President Obama has the lowest public approval ratings of any president in modern times."
Really? You start googling for evidence. Maybe you scour the blogs or the fact-checking sites. It takes work, all that critical thinking.
That's why Dan Schultz, a graduate student at the MIT Media Lab (and newly named Knight-Mozilla fellow for 2012), is devoting his thesis to automatic bullshit detection.