I’ve been working on my income taxes, and my brain is too fried to come up with any better topic. As a former CPA, I’m always fascinated by how we finance roads, bridges, military, and the countless other expenses of government. (The federal government—our taxes— represents 30% of the gross national product, making it the biggest industry keeping the economy rolling) Fun fact: the earliest known tax was in Mesopotamia 4500 years ago and was paid in livestock.