Fuel cell
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Comment by S.A.D on February 14th, 2012 at 7:52 am
This didn’t really help me because it is written in a very hard language. I am 12 and I still could t understand it. Also you could write something about why are fuel cells useful in Spacecrafts and other. I didn’t get any info from this Article. I think that having a required email is not very nice. What if people want to write to you but don’t have an email. Please think about it.
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