Car rental agencies report that a secondary market has developed, with American officers subletting four-wheel-drive vehicles at a 50% mark-up.

ECONOMIST: Kuwait, America and Iraq: My best friend's war | The

Officials from the National Transportation Safety Board have said they are examining the broken section of rail and the "witness mark" it left on one wheel of the first train.

WSJ: Metro-North Is Set To Restore Full Service Wednesday

From fire and the wheel down to the light bulb and the iPad, we mark the march of history by the steady beat of transformative innovations.

FORBES: By James L. McQuivey