RT @TimHarford @standupmaths: Give your loved one a r=a(1-Cosθ) http://bit.ly/dU5hIB #NerdValentines <-- how about a cup of tea w 1 on top?
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RT @TimHarford @standupmaths: Give your loved one a r=a(1-Cosθ) http://bit.ly/dU5hIB #NerdValentines <-- how about a cup of tea w 1 on top?