標題:Have humans passed peak brain power?

Data across countries and ages reveal a growing struggle to concentrate, and declining verbal and numerical reasoning

正文：What is intelligence? This may sound like a straightforward question with a straightforward answer — the Oxford English Dictionary defines it as “a capacity to understand” — but that definition itself raises an increasingly relevant question in the modern world. What happens if the extent to which we can practically apply that capacity is diminishing? Evidence is mounting that something exactly like this has been happening to the human intellect over the past decade or so.

知識點 ：straightforward adj.

easy to understand or simple. 簡單的，直接的

e.g. The instructions are straightforward and easy to follow. 這些說明簡單易懂。

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