There's a fact-checking summit going on right now in London.
It's a big deal to the journalists. Here's a Twitter pic from attendee Ivana C. Bajrovic showing PolitiFact editor Angie Drobnic Holan teaching PolitiFact's methods to others:
We're excited about the summit, too. Maybe the fact checkers will teach each other how to establish and hew to objective standards or even how to correctly calculate percentage error.