A Microchip's Water Disappearing Act

Too often do I see posts on Facebook about people dropping their phones in the toilet, bathtub, or ocean, and their desperate plea for friends' numbers. But what if you dropped it in water and it dissolved?? 
I see this in the next James Bond or Mission Impossible movie: After making a call, the spy drops his phone into his glass and the phone dissolves, leaving only a clear glass of water behind.

Professor John Rogers at the University of Illinois Urbana-Champaign has created a prototype for a silk-based micro chip - the beginnings of a wave of electronics that, he hopes, will catch on as being temporary. The plan is to have the electronics only have a set amount of "life" time and then the device will break down in water.
How do you feel about this? We hope that the electronic devices will be made from biodegradable material, so there shouldn't be any toxic traces in the water.

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