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This is Scientific American 60-Second Science, I'm Sarah Vitak.

So many of the objects we interact with nowadays run on programming and are designed with an

exact purpose in mind.

We don't typically think of living things as falling into this category, but more and

more scientists are programming and designing living cells and even whole organisms.

This area of research is called synthetic biology and there's a whole subsection of the

field that's all about figuring out how to engineer cellular armies that can be commanded

and controlled.

Cells trained to search out disease tissues.

Cells equipped for environmental reconnaissance.

Cell assassins that put out hits on other cells.

Sounds cool, right?

But in reality, nothing is that targeted and exact.

It's somewhat limited because those cells, ah, to date, they don't know spatially where

they are in the body.

Are they in a tumor, are they in the liver, are they in the pancreas, are they in the brain?

So, you know, they might try to figure that out based on molecular clues, but they don't

have this kind of GPS that's telling them that they're in the right place to carry out

their actions.

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