"The 4 Percent Universe": Dark matter and dueling scientists

Giffords, Palin and the blame game

Doctors: Testing Giffords' brain

Weapon in rampage was banned under Clinton-era law

Profiles of Tucson victims

J.R.R. Tolkien drank here: Literary watering holes

Let's not make this something it isn't

I'm 25 ... and I've wasted my life!

The real message of Loughner's book list

Government-created climate of fear

Palestinians say they'll go to UN for recognition

Unclear whether shooter's motivation was political

Watering the tree of liberty

Is this the end of American economic dominance?

Sarah Palin's Alaska finale: The campaign ad wraps up

'Birther' leader stymied by Supreme Court

The Giffords shooting's gay, Hispanic hero

"Californication's" atrocious masculine fantasy

Arctic storm blasts South, halts travel, kills two

Darwin's media: Surviving the info-glut

A violent song's latest, ugly encore

Just how many bases does the Pentagon have?

What will this do to Sarah Palin's '12 chances?

Poverty supresses children's genetic potential, study says

Giffords shooter fired 31 rounds