Like a cherry with a stone inside, if you press it too hard, the stone will fly out.

BBC: Eurovision 2012: Azerbaijan's gays not welcome at home

Being struck hard with a stone cobble might produce this type of injury, the researcher told BBC News.

BBC: 'Earliest' evidence of human violence

It's here that a Kurd named Abdullah Aslan is hard at work rebuilding the roof of a long-abandoned stone hut.

NPR: Turkey Threatens Economic Sanctions on Kurds

It is hard to imagine that McChrystal's decision to open his doors to Rolling Stone was a calculated move to blow the lid off of the mirage of strategic competence surrounding the "good war" in Afghanistan.

CENTERFORSECURITYPOLICY: The western way of war