SN Online SN Online Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Science News October 7, 2011 at 12:12 pm BODY & BRAIN ‘Normal’ B12 levels may not be enough for the brain. Read “B12 shortage linked to cognitive problems.” LIFE A penguin can find its kin even in a sea of black and white. See “Penguins may sniff out relatives.” ATOM & COSMOS A NASA probe has found bizarre landforms on the planet nearest the sun. Read more in “Messenger from Mercury.” HUMANS A teenager’s alcohol use is influenced by the friends of the teen’s boyfriend or girlfriend. See “ Teen daters pal up to the bottle .”