Observational studies are often misleading. Once randomized clinical trials are finally completed, it may turn out that chocolate does not actually produce much of a cardiac benefit after all.

观测研究常常会误导。一旦随机临床试验最终结束，也许结果巧克力根本不会产生很多心脏的益处。

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Once randomized clinical trials are finally completed, it may turn out that chocolate does not actually produce much of a cardiac benefit after all.

一旦随机临床试验最终结束，也许结果巧克力根本不会产生很多心脏的益处。

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"The 'a-ha' moment was when he found out that he could turn a metal part that was made in the medical industry into glass and he could produce it for way cheaper than anyone else, " Martindale said.

CNN: Hearts of glass: Where medical science meets art