有时候尽管我们的记忆很清晰，但是它所包含的事情却有可能未曾发生过，或者并未如我们记忆中的那样发生。 这也是为什么有时候目击者的证词与事实相去甚远。

We also all have memories – sometimes very clear ones – of events that didn't happen, or didn't happen the way we remember them, which is why eyewitness accounts of crimes are notoriously faulty.

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正如研究者们所料，年老猴子大脑中的记忆回路不像年轻的猴子那样能长时间保持活跃，尽管它们也和年轻的猴子一样在2.5秒钟这样短的时间之内也能保持清晰的记忆。

As expected, the memory circuit in the brains of older monkeys didn't sustain activity as well as in younger monkeys, even though they still performed accurately at this short time scale.

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