Classroom Questions QUESTIONS for Cool Jobs: Super Small Science Arrows point to elbows created in carbon nanotubes in this close-up of a nanotube sponge. The elbows are created by boron atoms, and give the material its sponginess. Mauricio Terrones/Pennsylvania State University Share this:FacebookTwitterRedditGoogle ClassroomEmailPrint By Science News for Students April 24, 2015 at 6:00 am Classroom questions are available for free with registration. Learn more Register to access: Client key* E-mail* Log in Already Registered? Enter your e-mail address above.