The human body is just another system component. I am surprised that it took this long for device manufacturers to realize the untapped source of innovation that the body represents.
I suspect we will see many new body integrated devices in the near future. Who knows, they might actually be useful.
Just my Opinion.
It takes a few seconds to destroy a hotdog in a microwave.
I don't trust wireless routers in our home, using mobile phones, living within meters of mobile phone transmitters.
In 50 years time they will blame RF's for human DNA ruptures and cancer.