The day before the right-wing world descended on Washington, D.C. to spew propaganda at the Conservative Political Action Conference, a media watchdog site set up a tool to counter those lies. Media Matters launched Mythopedia, an online database of right-wing lies and real truth about issues ranging from Don’t Ask Don’t Tell to what caused the BP oil spill.

Users can type in a query about any claim to see whether it’s a conservative lie.

Currently, there are some 400 entries. Soon, it may turn into a Wikipedia-style site, where highly involved users submit their own entries, with the Media Matters staff fact-checking them. But for now, anybody can submit a tip.

Here’s a video explaining the website: