Reply To: Prerequisites List?
My impression from browsing the newer edition is that the topics are more clearly related to each other and several of them go deeper than they did in the original, which would explain the increase in prerequisites.
The digital version from Outskirts Press is $5 for a PDF ebook. I would still rather have the paperback, but it is certainly a cost-effective way to access the updated information and it is nice to be able use the search function when making lesson plans. Science was never my best subject, so anything that makes it easier for me to understand and teach is totally worth it!
Amazon has a preview of the second edition. If you sign in, it will let you see pages from lessons A-5A (magnets and magnetic fields), B-5 (adaptations, food chains, and energy flow), and a few from B-6 (how animals move). You can also preview the Kindle edition, which has all of A/B-1 (organizing things into categories) and part of A-2 (solids, liquids, gases and change with temperature). The Kindle edition is currently $9.99.