I think I would like your browsing reader to come across “Chapter 4. Multitasking and the Metal Man: How Much Can Iron Man’s Mind Manage?” This chapter is important because I address the main reason why you couldn’t wear a suit of armor like it was clothing. This sets up the need for it to be directly connected to the brain and spinal cord.I frame this in the context of attention and how much—and how little—we have of this resource in different scenarios. This allows me to address some “simpler questions”, like why you shouldn’t use a cell phone while driving, and why pilots are so much better at multi-tasking. All of this is meant to both provide readers tangible points of reference to their own lives but also set up how complicated it really would be to use a brain-machine interface like the Iron Man suit of armor.In many ways I really like this part of the book. It gets at the thing we all are doing so much—multi-tasking. We do this routinely and some of us take it to extraordinary lengths. And very dangerous ones like texting while driving, an activity that has caused too many deaths already. It also sets up a point I come back to later in the book about how brain machine interface can allow us to use technology to amplify biology. But if the thing we want to amplify isn’t working well, we just get something louder that works poorly on a grand scale! Garbage in, garbage out.We need really good inputs in, and better outputs on the other side if we really will use brain machine interface. This means training is needed to create a finally tuned nervous system. And is a kind of nod to some of the themes in Becoming Batman. Bottom line is: we cannot escape our biological functions!There are two main take home messages from Inventing Iron Man. I truly hope readers gain additional insight into the amazing ability for adapting and changing that the nervous system has. If you expose yourself to the right training stresses, you can adapt and tune yourself in marvelously complex and useful ways—even if not necessarily to control and robotic suit of armor with your mind! Another message is we should start to think about how to regulate our interface with technology now—before it really is feasible to do all of what I explore in Inventing Iron Man. There are big ethical (how will we use our enhanced abilities?) and safety (how does it change our biology?) issues here. Let’s try and address some of them in advance.I have always been fascinated by brain machine interface and have mused about how far such interfaces can go. Inventing Iron Man represents my musings using a tangible pop culture icon. I like to think of this concept from the perspective of rehabilitation and how to improve and restore function. With this in mind, this kind of brain machine interface could be amazingly useful. Or amazingly dangerous. Or both.