Comment: This explains some of the sheep, but seriously, -

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This explains some of the sheep, but seriously, -

"reckless driving and a greater risk of suicide"

sounds more like emotion/inhibition (like alcohol & certain drugs), than (mind)"control"

Some additional info on Toxoplasma gondii:

http://www.ext.colostate.edu/safefood/newsltr/v7n4s01.html

http://www.cdc.gov/parasites/toxoplasmosis/

Interesting to note the infection numbers between the sources. Seems no one really knows.