Pretty cool. In fact the Army is going to use a variant for a future weapon, but this $35 toy turns water into hydrogen fuel. Cool. http://www.google.com/products?q=hydrogen+fuel+rocket&ie=UTF-8&oe=utf-8&rls=org.mozilla:en-US:official&client=firefox-a&um=1&sa=X&oi=product_result_group&resnum=1&ct=title