About the weight of nanocomposite: it weighs 120kg? In research mail it was written that carbon nanotube things weigh less than any other material (about 100 times, like instead of 120kg, it should weigh 1.2kg). Besides, it conducts electricity, and about that, i have an idea (quite frequently heard one): a lightsaber. So if you've watched sci-fi science show, you'd know.