These brief comments will reflect the point of view of an observer, rather than a theorist. They will also be quite informal, as were the remarks I made while at the symposium in The Hague. Finally, I will restrict myself to relatively low energy proton backgrounds-roughly speaking from 10−5–101eV. I fear that will slight the important work being done by our colleagues on the X-ray and gamma ray backgrounds, but those topics were nicely covered in the symposium itself.