Five things worth knowing today

- It's World AIDS Day, dedicated to raising awareness and funds to combat the virus and support those affected.
- San Francisco celebrates the anniversary of Prohibition's rollback a few days early with Repeal Week, sponsored by a restaurant and bar called 21st Amendment. One guess which amendment that is.
- Bosnian author and National Book Award nominee Aleksandar Hemon reads from his work with Amitav Ghosh at the 92nd St. Y. He'll be fielding questions afterwards, so be sure to get his two cents on Sarajevo Fashion Week, which continues through tomorrow.
- Today in 1955, Rosa Parks refused to give up her bus seat in Montgomery, Alabama, prompting her arrest and sparking the Montgomery Bus Boycott. Never thought we'd say it, but the phrase "You go, girl" does indeed come to mind.
- And today in 1970, comedian and general offender Sarah Silverman was born. Below, Silverman regales Leno with a list of similarities between African-Americans and Jews—the germ of "The Great Schlep," her pro-Obama video which actually may have helped the guy win Florida. (Or at least didn't hurt.)