Jerk is defined as the time derivative of acceleration. Simple methods for designing jerkmeters are briefly discussed.

A tetrad of rash, arthralgia, abdominal pain and kidney disease in a child is pathognomonic for Henoch-Schönlein purpura.

No Savile Row suit, no pure silk business ensemble, no costume of any sort, modern or ancient, can possibly beat the traditional aloha shirt for pure form-follows-function glory. Put on a real aloha shirt, with primary colors detonating all over the surface, and you couldn't hang on to a bummer of a mood if your sister was dating Saddam Hussein.

Its development is considered to be secondary to the formation of a thick fibrous pseudosac following arterial wall injury and haematoma organization.