Birds and Frogs (2009) [pdf](ams.org)
ams.org
Birds and Frogs (2009) [pdf]
http://www.ams.org/journals/notices/200902/rtx090200212p.pdf
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This is an article by Freeman Dyson from the Feb 2009 issue of Notices of the AMS. He explains the necessity of both birds, those that explore in breadth, and frogs, those that explore in depth.