以同样的方式铁可以被制造成像长柄平底煎锅和剑这样不同的产品，纳米技术产品的有用或有害完全要看它们在纳米范围上是怎样被制作的。
In the same way that iron can be made into products as different as skillets and swords, the usefulness or harmfulness of nanotechnology products depends on how they are crafted at the nanometer scale.