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Another interesting one is pi: http://www.google.com/trends?q=pi

Ignore the spike near 14 March and look at the log low dip in summer and the sharp upslope in August-September.

Other very seasonal queries: http://www.google.com/trends?q=mushrooms

Also, for some reason, "DYI", "pi", and "horses" all had large spikes around the end of 2007. Anyone want to guess why? Data gremlins?

http://www.google.com/trends?q=diy%2Cpi http://www.google.com/trends?q=horses%2Cdyi%2Cpi



I wouldn't be surprised if the "pi" trend correlates well with vacation times in academia.


Sure, but are school curricula really that well coordinated across the english-speaking world? I'm kind of surprised that the graphs match so well:

http://www.google.com/trends?q=natural+logarithm%2Cbase+10%2...

http://www.google.com/trends?q=hamlet%2Csocrates%2Ctruman


We may be reading too much into this: http://www.google.com/trends?q=base+10%2Cdirac%2Ccheerios...


Yes, but : http://www.google.com/trends?q=base+10,dirac,+wrist+band&...

This is a US specific plot, but the world wide one is similar. There are plausible explainations for a correlation between the type of breakfast and the school cycle.

The spike at the end of 2007 appears for any queries when you look at the world-wide data.




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