Need a water filter? Peel a tree branch | MIT News Office Posted on September 24, 2014 by timbatchelder Need a water filter? Peel a tree branch | MIT News Office. Rate this:Share this:EmailTumblrFacebookRedditLinkedInPrintPocketPinterestTwitterWhatsAppLike this:Like Loading... Related Published by timbatchelder View all posts by timbatchelder