But an important lesson from the last 50 years is that when it comes to improving heart health, it is important to look beyond the medicine cabinet.

而过去50年来得到的最重要的教训是：要增进心脏健康，功夫在药物以外。

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The lesson of the past 50 years, however, is that the more humanity discovers about space, the rarer and more precious life on Earth seems.

50年的空间探索告诉我们，人类对宇宙了解得越多，地球上的生命就越显珍贵。

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Next year will mark 50 years since China taught a military lesson to India. Will history repeat itself after 50 years?

明年是中国痛扁印度50周年纪念，历史会在50年之后重演吗？

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According to Adrienne Germain, that is the main lesson we should learn from the past 50 years.

BBC: The world at seven billion

Today, more than half a million teachers in nearly 50 countries use Innovative Teachers Networks to share thousands of lesson plans and innovative digital-classroom resources.

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