Usually it's the needle procedure Witkowski had, called amniocentesis, done almost four months or more into the pregnancy.

通常这种检查就是华沙所做的穿刺手术，叫作羊膜穿刺检查，一般在怀孕四个月或更大月份的时候做。

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Another group, led by William Ditto at the Georgia Institute of Technology and Francis Witkowski at the University of Alberta, is using a dye that lights up in response to voltage changes to map the heart's response.

ECONOMIST: Better living through chaos