Telepathy or the ability to communicate outside the known senses has always fascinated me and many others alike. Many probably wonder why nature hasn't come up with this way to share information between mammals. Of course we humans have invented ways to send information wirelessly across the ether using electromagnetic waves and complex electronic devices. Now humanity has reached a technological development point where all our knowledge can converge towards the creation of the world's first direct brain to brain communication device. We know how neurons work and how they signal information. We know everything about using electrical and electromagnetic signals to transmit and convert information. We have all the nanotechnological and nanoparticles fabrication means at our disposal to build such a device. We just need to make it happen.
My specification aim for this device would be a 1x1 cm, 0.3 cm thickness earing type of device. I have chosen the ear as the place to fit it because it has one of the highest unused free nerve endings density of any body part. We frequently use the ear as the carrier of jewelry type items, but in fact it has no known biological role!!! So let's find one for it. The device will contain a small rechargeable battery, a bluetooth communicator, amplifiers, a microprocessor and around 10000 gold nanowires of about 50 micrometres in diameter.
Once the device is installed on the ear the wires will pneumatically start deploying through the outer layers of the skin into the ear tissue and will connect to the termination of the nerve endings. The deployment of each wire will be individually controlled by a feedback loop and nanoactuator valves which will stop deployment once the wire makes contact with the nerve ending and an electrical signal is sensed.
Interacting with the mind-microdevice interface will be a learned process just like learning a new language but will finally lead to things like direct thought exchange between two wearers of the device and direct mind to smartphone communication via a dedicated app.
Of course this idea is still in its infancy, never tried and tested but 100% reliable and doable from a scientific and practical perspective