Jimmy Fallon: Particle Smaller than Atom, Brett Favre

JIMMY FALLON: This is a major science story, you guys, major science story. Researchers in the U.S. have discovered a new particle smaller than the atom. It's unbelievable. We actually have a photograph.



It's hard to tell what it is. Can we widen out?

Jimmy Fallon: Government Shutdown

JIMMY FALLON: It turns out the White House might have to lay off staff members if the government shuts down on Friday. It's really bad news for nonessential workers - interns, pages, Biden.

Stephen Colbert and Jimmy Fallon - 'Friday'

After a successful fundraising effort, Stephen Colbert appeared on Late Night with Jimmy Fallon to perform Rebecca Black's "Friday" with The Roots.

Taylor Hicks and the Knicks City Dancers also took part in the extravaganza that included pyrotechnics, confetti, and balloons.

It was electric.

Enjoy the magic.

Casey Abrams and Jimmy Fallon

Last week, Casey Abrams was almost voted off American Idol. The judges used their "save" on Abrams and he survived to sing another week.

However, sensing his days on Idol may be numbered, Casey Abrams has been doing product endorsements. Some were shown on Wednesday's Late Night with Jimmy Fallon.

Watch the video:

Jimmy Fallon: Obama, 'Dancing with the Stars'

JIMMY FALLON: Last night, President Obama's speech on Libya was actually scheduled early so it wouldn't interrupt Dancing with the Stars. That's ridiculous. This is a major historical event that affects the lives of millions of people. I can't believe it was almost interrupted by Obama's speech.

That's right. Last night, there was another big episode of the show Dancing with the Stars. Yeah, but it was preceded by Obama's new show - Dancing around the Objectives in Libya.

Critics are saying that President Obama seemed defensive and slightly angry during his speech on Libya. Sounds like somebody's March Madness bracket isn't doing so hot.