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I don't really understand what is this man is trying to say to us all i know is he's talking about science he was talking about chemistry i guess he was trying to say there are other ways to heat up our homes with out using the main source. I think the reason why we are watching this video is because there's alot of ways to do things like making clothes or sewing clothes because a lot of people can do that, if they can make it why do they need to buy ours?, well then we have to make better quality clothes. just like this we can make heat our house with out using the main source but it wouldn't be as warm as the main source.