It's not just computers--hacking is everywhere. A hack is any means of subverting a system's rules in unintended ways. The tax code isn't computer code but a series of complex formulas. It has vulnerabilities; we call them "loopholes." We call exploits "tax-avoidance strategies." And there is an entire industry of "black hat" hackers intent on finding exploitable loopholes in the tax code. We call them accountants and tax attorneys. In...