http://tierneylab.blogs.nytimes.com/2009/02/09/oops-make-that-four-forms-of-pure-boron/?emc=eta1 Denise ------------------------------- Denise Brehm Sr. Communications Officer MIT Dept. of Civil & Environmental Eng. Room 1-378 77 Massachusetts Avenue Cambridge, MA 02139 617-253-8069 brehm at mit.edu http://cee.mit.edu