The notorious Welsh pirate, Black Bart, promised a pension of 800 pieces of eight- that's silver- to any of his crew who lost a limb or were disabled in battle.

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The regulation of clinical trials alone has seen 18 new pieces of national legislation and eight European directives since 1995.

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But these turn out to be not much more than cannonballs mainly, a few badly eroded pieces of eight and an early 19th-century American half-dime.

BBC: In search of pirates in Panama