PodBlack Cat is hosting a happy face Encephalon, with mind/brain bloggers pitching in such posts as a colorful Whorf bias, the epigenetic regulation of stress (and not a happy story, this one), and how cognitive training works.

Health Business Blog is hosting this week’s Grand Rounds of medical blogging. From freak show to self-help salon, it’s got it all. Like waiving your rights to say bad things about your doctor on the internet (i.e, freedom of expression) and self-esteem and mountaineering!

moneduloides is hosting the Carnival of Evolution, including Darwin’s degenerates and explaining cancer through game theory.

And for more on the great Carnival/Carnaval in Barranquilla, you can get some photos and music here and the official Colombia site here.