Was it because my lovely French friend (who had an e-ARC of Open Minds) posted a review on Amazon.fr? It's certainly due to the fact that the French are just starting to buy books there, so it doesn't take much in sales to get on the bestseller list. Yet, I have to admit to being thrilled at being anywhere near Hunger Games on the Bestseller list anywhere in the world!
Merci to my French friends!
p.s. UPDATE: Open Minds is also #6 on the SF&F list in Germany! :)