Final answer:
It is generally false that you cannot search past articles on Eastman's online newsletter, as most newsletters provide a search function or archive to access old content, but this can vary based on the specific website's features.
Step-by-step explanation:
The statement "you cannot search past articles posted on Eastman's online newsletter" is false, assuming that Eastman's online newsletter has a functioning archive or search feature.
Most online newsletters and publications offer a search option or an archive section where you can access and read past articles.
If the online newsletter is well-maintained, users should be able to easily locate and peruse previous content.
However, without specific information about Eastman's newsletter, this generalization can vary based on the actual features and functionalities available on their website.