3.5 rather than 3.
I wanted to like this book more than I did. It feels rather padded with ideas repeated several times, and a reliance on very specific kinds of sources. So for example there is a very good discussion about the discussion *around* science teaching, but no investigation into the text book industry, the training of science teachers etc. There is the excellent use of Westinghouse Science fair records to look at how competitors were perceived and written about, and Onions has found a follow up survey, but there does not seem to be any attempt to advertise for participants and conduct her own survey (which would have been particularly valuable for women participants--how many were influenced by their path from science fair to home maker, to become involved with second wave feminism for example?). The result is a book that is very good "as far as it goes" but it doesn't dig very deep.
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One alert: I was a bit bothered at first by the piece on Heinlein. The very first mention on p. 6 adds "(and often female)" to Heinlein's disparagement of school teachers. Heinlein had many faults but he was one of the champions of female education and participation in science. When I got to the section on Heinlein in chapter 5 I was even more uneasy. I began to get worried that I had missed crucial material in my own work on Heinlein. Then I realised that although Onion is on the side of his editor (Alice Dalgliesh), she has still made the mistake of assuming that Heinlein's shaping of the accounts is correct. So for example, if you take a look at Dalgliesh's editing of Red Planet (the unrevised version is now available) what she forced him to cut was a wet dream and some rather careless gun use. But more important was that I realised Onion just doesn't know the books. Dalgliesh may have made Heinlein cut a scene in which a boy pulls a knife on his stepfather after he is beaten, but it can't be Farmer in the Sky, because there isn't a step father in that (I suspect she means Starman Jones); similarly it's not John Thomas who divorces his mother in Star Beast, but his girlfriend Betty. I know books are open to interpretation but it's also telling that she doesn't discuss the female protagonist in Have Space Suit Will Travel, doesn't realise that Betty in Star Beast has actually negotiated a career for herself in a 1950s environment, or that while Rod's sister in Tunnel in the Sky gives up her career to get married... it's to a man who has given up his career to get married because they are off to settle a new world.