SN Online SN Online Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Science News August 26, 2011 at 10:32 am SCIENCE & THE PUBLIC BLOG Space junk is lasting longer, making cleanup more urgent. See “Growing need for space trash collectors.” HUMANS A 2,000-year-old human skull shows signs of having undergone surgery. Read “Ancient Saharan head cases.” Instant messaging can’t replace the soothing sound of Mom’s voice. See “Moms talk, daughters’ hormones listen.” GENES & CELLS Breaking bonds between protein buddies may help prevent Parkinson’s. Learn more in “ Parkinson’s protein comes in fours .”