So pay attention. In a mere 15,000 years, humans went from hunting and gathering to creating such improbabilities as the airplane, the internet, and the 99-cent double cheeseburger. It's an extraordinary journey, one that I will now symbolize by embarking upon a journey of my own, over to Camera 2. Hi there, Camera 2, it's me, John Green. Let's start with that double cheeseburger. Ooh, food photography! So this hot hunk of meat contains 490 calories.