Interesting I think

Reasoning Is Sharper in a Foreign Language

By Jessica Gross
We might be least rational about money in our native tongues

http://www.scientificamerican.com/article.cfm?id=reasoning-is-sharper-in-a-foreign-language

© 2012 Scientific American, a division of Nature America, Inc. All Rights Reserved.
Reproduction in whole or in part without permission is prohibited.

Not that you need more reinforcement for choosing French Immersion for your child!