Surgeons often electrically stimulate the area around the tumor while the patient is awake and can provide feeback, so they can avoid damaging critical tissue.

外科医生经常会在病人清醒的时候用电流刺激肿瘤周围的脑组织，观察病人的反应以避免切除那些没有坏死的部分。

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They have evolved special "heaters" of modified muscle tissue that warm the eyes and brain, maintaining peak performance of these critical organs.

它们进化出了一种特殊的“加热器”，由经过改造的肌肉组织构成，可以温暖眼睛和大脑，使这些关键器官保持最佳状态。

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All of these are critical to proper functioning of the tissue, and now we know their origins.

所有这些细胞都是该组织功能能够正常运行的关键因素，而现在我们知道它们的起源。

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Research in massage therapy, for example, is in its infancy, and little is known about the basic physiological effects of various techniques on tissues such as capillary beds, connective tissue, chemical markers, etc, so basic science research is critical in advancing our understanding of the various physiological effects of massage therapy.

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Since water is critical to most biological processes, following it around can reveal a lot about the health of the tissue involved.

ECONOMIST: Dyslexia