In elementary school most of us had a class called Science. Later on that was broken up into physics, chemistry and biology -- and generally science has been broken up ever since.
Nanotechnology poses a challenge to those traditional clear-cut divisions. At the nanometer scale physics, chemistry and biology are inescapably intertwined -- resulting in developments that are difficult to classify.
Case in point: Nanowerk has a great article on "green" nanotechnology; using plants to fabricate inorganic nanomaterials. Nanotechnology is vividly demonstrating how the divisions we use to organize science are not necessarily natural divisions at all, but artifacts of our own thinking.
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