Little tiny pieces of gold accumulate in rapidly-growing cancer cells' blood vessels. Then a special light is shone on the tumor and they act like antennae, heating and killing the cancer.
OR
Little tiny machines find cancer cells and broadcast their location. Then other little tiny machines find the first lot and inject chemotherapy drugs directly into the tumors.
Just wow. A little scary, and hey what happens to other cells in the body that these little devices are floating around in, but wow.
gizmag.com: if you're not reading it, you're missing out.
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