ebook version of Make Rockets is extremely large (465MB)


I just purchased the ebook version of "Make Rockets" and was surprised to see that the file is extremely large. It is 465MB, compared to other ebooks (also with many photos, etc.) at 25-75MB. I suspect that this must be an error, due to some photos included
with too high a resolution, is that possible? Will future revisions of the ebook be
somewhat smaller, to facilitate putting it on mobile devices with limited space?
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