Bionic Ears and Microphone Fingernails – Oh My!

Everywhere you go, you can find scientists and engineers doing 3-D printing. They may be using it to print bridges over water, or buildings and houses, or even hearts and livers and skull parts. In fact, we’re hearing so much about 3-D printers creating the normal and ordinary stuff all over again, that it’s becoming pretty boring.

This, of course, is how technology makes progress: slowly, and with iterative changes being added all the time. We’re currently using 3-D printers just to create all the old stuff, which we’re used to. The makers and creators are mainly interested today in demonstrating the capabilities of the printers, and put less emphasis on actually innovating and creating items that have never existed before, and of course, the clients and customers don’t want anything too extraordinary as well. That’s the reason we’re 3-D printing a prosthetic ear which looks just like a normal ear, instead of printing a Vulcan ear.

What happens if we let go of the ordinary and customary, and begin rethinking and reimagining the items and organs we currently have? That’s just what Manu S. Mannoor, Michael C. McAlpine and their groups did in Princeton and Johns Hopkins Universities. They made use of a 3-D printer to create a cartilage tissue the shape of a human hear, along with a conductive polymer with infused silver nano-particles. The end result? A bionic ear that should look and feel just like an ordinary ear, but has increased radio frequency reception. It is not far-fetched to say that Mannoor and McAlpine have printed the first biological ear that could also double as a radio receiver.

Mannoor, McAlpine and team's 3D-printed bionic ear, with enhanced radio reception capabilities. Originally from paper "3D Printed Bionic Ears"
Mannoor, McAlpine and team’s 3D-printed bionic ear, with enhanced radio reception capabilities.
Originally from paper “3D Printed Bionic Ears

Where else may we see such a combination between the biological and the synthetic? This is a fascinating thought experiment, that could help us generate a few forecasts about the future. If I had to guess, I would venture a few combinations for the next twenty years –

  • Radio-conductive bones: have you come for a hip replacement, and also happen to have a pacemaker or some other implant? The researchers will supply you with a hip-bone printed specifically for you, which will also contain conductive elements that will aid radio waves go deeper into the body, so that the implants can receive energy more easily from the outside by radio waves or induction of some kind.
  • Drug delivering tattoos: this item is not 3-D printed, but it’s still an intriguing combination of a few different concepts. Tattoos are essentially the result of an injection of nano- and micro-particles under the skin. Why not use specific particles for added purposes? You can create beautiful tattoos of dragons and princesses and butterflies that can also deliver medicine and insulin to the bloodstream, or even deliver adrenaline when pressed or when experiencing a certain electrical field that makes the particles release their load. Now here’s a tattoo that army generals are going to wish their soldiers had!
  • Exquisite fingernails: the most modern 3-D printers come with a camera and A.I. built-in, so that they can print straight on existing items that the user places in the printer. Why don’t we make a 3-D printer that can print directly on fingernails with certain kinds of materials? The fingernails of the future – which will be printed anew every day – might contain tiny batteries that will power smartphones by touch, or microphones that could record everything that happens around the user.
3D printed fingernails by TheLaserGirls. Offered for sale on Shapeways.
3D printed fingernails by TheLaserGirls. Offered for sale on Shapeways.

These are obviously just three rudimentary ideas, but they serve to show what we could gain by leaving behind the idea that new manufacturing technologies should adhere to the “old and proven”, and advance ahead to novel utilities.

In the end, the future is never just “same old same old”, but is all about shedding off the customs of the past and creating new ones. And so, if I had to guess, I would wager that such a unification of concepts into new and bizarre devices would give us a much more accurate view of the future than the one we gain in the present by showing how 3-D printers can build yet another house and another human organ.

What are your ideas for future combinations of biological and synthetic components? Write them down in the comments section!

A School Is Engineering Children’s Brains with Electrical Current

Your child comes home from school, crying again. As you try to gently comfort him, he weeps openly on your shoulder – “The numbers won’t stop moving on the blackboard, and I couldn’t do my homework again and Tom said I was stupid!”

After a prolonged talk on the phone with Tom’s mother, you decide that something needs to be done. By now you know that your son has been diagnosed as suffering from dyscalculia: a difficulty in understanding numbers, which afflicts 3 – 6 percent of the population. But what can you do about it? If he had ADHD, you would’ve prescribed Ritalin for him, but there’s no easy and simple treatment you can give him to fix the problem. He’ll just have to work much harder than everyone else to understand math, because of the way his brain is shaped. That’s just the way nature works, right?

Well, we humans are particularly good at circumventing Mother Nature’s whims, and now there’s a new treatment for dyscalculia of a very different sort than anything else before it: basically, this treatment is all about re-engineering the brain of the child, from the inside.

The treatment, which goes by the scary name of Transcranial Magnetic Stimulation (TMS), relies on a helmet that generates magnetic fields inside the brain. Those magnetic fields, which can be focused on small areas in the brain, can enhance or inhibit the communication of the neurons in those areas. Essentially, we’re performing a brain surgery from within the skull, without lifting a finger or using an invasive tool of any sort. And the results are nothing less than astounding.

Despite the fact that TMS is a relatively young technology (the first successful study using TMS was conducted in 1985), it has already been approved by the FDA to treat depression and migraine. The only problem with TMS was that it requires a strong magnetic field, which can be generated (currently) only by a large and cumbersome equipment. In short, this means that TMS can only be used in the lab.

Transcranial magnetic stimulation.jpg
An illustration depicting the magnetic field being operated on a human brain.

But we did say that humans are good at circumventing problems, right? And so, meet TMS’ more nimble brother, the Transcranial Direct Current Stimulation, or TDCS. The idea here is to deliver a low electrical current to the area of the brain you want to influence. Scientific studies have shown that by focusing on specific areas of the brain we can enhance language skills, attention span, memory and – yes, you guessed it – mathematical ability. What’s more, the technology can be used with a pinpoint accuracy, and without having any serious side effects (at least as far as we know).

You’re waiting at the school for children with learning difficulties. Your son sits in front of you, serene and calm, with his eyes closed. After twenty minutes, the school’s nurse removes the electrodes from his forehead, and he opens his eyes again and smiles. She shows him the numbers on a blackboard, and this time he reads them all fluently.


This scenario is not science fiction or fantasy. In fact, it’s happening right now. In a recent research conducted by Roi Cohen-Kadosh from the University of Oxford, twelve children at the Fairley House school received nine training sessions with a variant of the TDCS technology. Six of them received the actual treatment, and the rest wore the cap and the electrodes, but did not receive any stimulation. As expected, the children who received the stimulation reached significantly better mathematical achievements than their friends.

A child using Transcranial Direct Current Stimulation. Is this the new form of learning? Image originally from a blog post in Scientific American, by Gary Stix.

The Age of Brain Engineering

There is still a debate whether or not TMS and TDCS can be used to enhance the brain’s function to more-than-human levels, or ‘just’ to negate quirks in the brain like dyscalculia and ADHD, and elevate the person to the normal level of the population. But what are those ‘normal’ levels? Is that an IQ of 100? Or maybe 120, or even 150? Approximately half of the population has an IQ lower than 100. How much would they benefit from a weekly treatment that would jumpstart their brains to the average level?

The debate about human enhancement, therefore, largely misses the full consequences of brain-engineering technologies like TMS and TDCS. Those technologies allow us to engineer the brain, and what’s more – they’re becoming cheap and easy enough to use, that anyone who really wants to can use them. There are already companies working on bringing the technology to the masses, like – a company that sells transcranial stimulators that should enhance the brain’s functions for gamers. There’s even a Youtube vid that shows you how to make a TDCS of your own for about 20 dollars (careful, I’m not endorsing that!)

Cohen-Kadosh himself is already envisioning a future in which people “…plug a simple device into an iPad so that their brain is stimulated when they are doing their homework, learning French or taking up the piano.” And while we are obviously not quite there yet, there is no reason we couldn’t get to that point within ten years. After all, Facebook changed the entire way people communicate in just ten years. Why not brain technologies, particularly when they are of the non-invasive sort?

Admittedly, these commercial technologies are still in their diapers right now, and are probably more razzle dazzle than real substance. However, as the technologies mature, we will gain the ultimate power over our brains, and will reach a time of Cosmetic Neurology – when we’ll be able to alter our moods, our abilities and our perceptions according to our wishes. This development might happen in ten or twenty or even thirty years from now, but when it comes, you, me and everyone else will need to answe the question: will we re-engineer our brains?

You’re back at the house. The kid is happily solving mathematical equations in his notebook, while simultaneously watching TV and chatting with his friends on Facebook. You, in the meantime, are still struggling with that new coding language the boss asked you to study this week. You’re tired and miserable from exerting your brain so much. You take a glance at the kid’s TDCS kit, which the school supplied you with, and for a moment… you wonder.