**Response to @paulg:**
One encouraging thing I notice from this graph: after slowing down between 1951 and 1991, the rate of progress started to increase again between 1991 and 2011. So much for mid-century dynamism.
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**Response to @paulg:**
One encouraging thing I notice from this graph: after slowing down between 1951 and 1991, the rate of progress started to increase again between 1991 and 2011. So much for mid-century dynamism.
No replies yet.