“Self-tracking and self-experimentation—the core of neurohacking—are easier to do now than they have been at any other time in history. We have smartphones with apps that can log your data automatically. We have free spreadsheet tools to document our experiments. You can order many tests and interventions from the comfort of your own home. Even if you prefer pencil and paper for tracking, you can still find online communities in which to get tips and troubleshoot. Doctors are more open to self-tracking than they were a decade ago, when I first began the research for this book. That means that you can (and should!) share your findings with your doctor as you track yourself and run your self-experiments. You can provide data that can”