"Cow's Skull: Red, White and Blue" is a well known work by American artist Georgia O'Keefe.

VOA: special.2010.08.04

He was a member of Skull and Bones-- have you heard of that?

他是骷髅会的成员之一,听说过吗

耶鲁公开课 - 金融市场课程节选

No feeling of a broken bone in the skull.

VOA: special.2009.10.28

His latest study is this skull bone of ceratosaurus , a large predatory dinosaur.

VOA: standard.2009.12.08