Pasted from Gizmodo:
The biological cell is an extremely advanced microscopic entity that can look after itself, but it's not exactly what you'd call smart. That's all about to change, though, because scientists are now making cells that can perform arithmetic—and the next stop stop is a living implant that can act as a computer.
Scientists at the Swiss Federal Institute of Technology in Zurich have created biological versions of digital circuits inside two sets of embryonic kidney cells. One is a half adder, the other a half subtractor—in other words, they're circuits capable of adding or subtracting binary numbers.
In fact, they're the most complex biological circuits yet created, and the idea is that they could be put to use in computational devices for the body to diagnose diseases, administer drugs or even interface with other electronic devices. The development is published in Nature.
Source -> http://www.nature.com/nature/journal/vaop/ncurrent/full/nature11149.html via http://www.newscientist.com/article/mg21428683.000-bionic-cells-can-do-basic-arithmetic.html via http://gizmodo.com/5916248/biological-cells-can-now-do-arithmetic
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