 OK, what we are looking at here is energy scale. Energy scale basically gives us different things, or it puts different energy consumption in perspective. For example, a BTU is defined as energy required to raise the temperature of one pound of water through one degree Fahrenheit. This is a small amount of energy. It is one single BTU. That is the unit. It's like a dollar. A dollar can buy you certain things. And when somebody says, I bought 10 pencils, immediately it strikes you that it is roughly about a dollar or so. If somebody says, I bought a computer, you immediately think about thousands of dollars, a thousand or two, and so on. If somebody says, I bought a car today, which means tens of thousands of dollars. Similarly, somebody buys a home. It is hundreds of thousands of dollars. It could be 100,000, could be 200,000, 3,000, 100,000, and so on. That is the scale that we are looking at here. We know on the energy scale, one BTU is the basic unit. And on the same scale, if you look at average daily human food intake is about 10,000 BTUs. And in a gallon of gasoline, we have about 100,000 BTUs, or even slightly higher. What this tells us is that a gallon of gasoline can basically provide a human being with 10 days' worth of supply of food intake, or the same number of BTUs, basically, or calories, in other words. So technically, we can survive with one gallon of gasoline or equal in number of BTUs for about 10 days, a human being. Similarly, everyone in the world consumes about 65 million BTUs per year annually. World per capita annual energy consumption is roughly about 65 million BTUs per person. So every person is consuming 65 million BTUs a year. If you compare that with the United States per capita consumption, that is about 300 million BTUs, or slightly over that, actually, per year, per person. Which means that in the United States, every one of us is consuming roughly five times than what an average person in the world would consume energy-wise. And on the same scale, we can compare different things. This is total annual energy consumption by the United States as a country. The whole country, which is roughly about 100 quadrillion BTUs. A quadrillion BTUs is 10 to the 15. A quadrillion BTUs is 10 raised to the 15, which is 1,000 trillion. Similarly, if you look at here, world per capita energy consumption, that is about roughly 400 quadrillion BTUs, which is four times the United States energy consumption. To put things in perspective, what we can say is United States consumes about 1 fourth of the entire world's energy. And we say that we are consuming a lot of energy and the world is today is consuming a lot of energy. But look at this. Look at this here. Annual energy that is reaching from the sun, free of cost, is roughly 10 to the 22, which is kind of 22 to 23,000 times more than what the entire world today consumes in a year. Then I want you to think about this. Then why are we worried about energy? If we are getting 22,000 times more than what we consume, free of cost, every year, then why are we worried about energy? Think about that.