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On the science & art of list definition:
The science: To be listed, it is necessary for a feed to have at least 5,000 Twitter followers, at least two of whom are list members, and for the feed to belong to an individual.
The rest is art: List members may have a variety of roles in science writing: columnists, reporters, editors, book authors, bloggers, and so on. This list is focused on individuals engaged in science writing as their profession, and therefore it excludes working scientists who also write for general audiences. Some such scientists may be found on the separate lists of astronomers and physicists on Twitter.