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	Podcast:		4. Chemistry and Physics
	Episode:		Solar Energy
	Category:		Science & Medicine
	Duration:		00:01:21
	Publish Date:		2011-07-13 19:48:51
	Description:		Transcript: Almost all energy on Earth has its origin with the sun. Think about the chain of events that makes it possible for you to move. That’s a form of kinetic energy of your motion. Your motion is only possible because of the food you eat. You are turning chemical energy stored in the molecules of the food you eat into stored energy in your body and then into kinetic energy. But what about the food you eat? You’re at the top of the food chain, and that energy probably came from another form, such as meat. That’s another form of stored chemical energy. That part of the food chain, say a cow, was eating a grain, another form of chemical energy stored in the starches of a grain. Where did the grain get its energy? From photosynthesis. Photosynthesis is a process whereby sunlight is stored in chemical bonds. If we think of it this way, almost every energy source we have and all the energy in our everyday lives can be traced back directly to one place: the sun. The source of the sun’s energy is nuclear energy from the conversion of hydrogen into helium by the fusion process.
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