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And I suspect that's the answer to this one too!

Not necessarily, because that assumes that the horizon is at ground level. If I'm reading the calculator right, it appears that at that distance the first 38 metres of an object will be obscured, but anything above that (like a big hill) could still be visible.

Hmmmmm http://www.nhs.uk/news/2014/06June/Pages/Pesticides-linked-to-autistic-disorders.aspx