在此之前，科学家只知道一种称为载脂蛋白e4 (APOE4)的基因会增加患最普遍老年痴呆症的风险。

Previously, scientists knew of only one gene, called APOE4, which increases the risk of developing the most common form of the disease.

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今天要给大家介绍一种“铜钱树”，在此之前我对它的存在一无所知，简直可以称为上周“头骨镍币”的姊妹篇了。

As perhaps a companion piece to last week's skull nickels, here's yet another thing I had no idea existed.

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卡尔·桑迪将这一过程称为一种“前馈”循环，在此过程中胰岛素刺激骨钙蛋白的生成，而骨钙蛋白反过来可以刺激更多胰岛素的产生。

Karsenty calls this process a "feed-forward" loop, where insulin stimulates the production of osteocalcin, which in turn stimulates more insulin production.

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