Don't you keep some old UV lamp for erasing EPROMs? No idea whether it will be strong enough though. I think there were some kitchen absorber grade lamps, one of these I had was strong enough to erase EPROMs non-reverseably.... I have been tending some roses last almost 3 years (still pretty ignorant about it) and I got something to spray against black spots, the latter turned out to be some fungus. Now if moss is fungus this might work as well; leave during the night, rinse before you get under the shower - can't do you any harm... well, not much harm anyway :).
I applied with a start up that was developing some UV cold cathode santiziation product this year. Guy told me during the interview one of their employees temporarily blinded themselves working on the project, like they were proud of this incident as evidence their driver board they had subcontracted to someone else was sorta working properly.
I skiied for a few days at Aspen Highlands, with plain glass glasses. I went snowblind and had to drive home that way. It was awful.
I have a "UV burning laser". I can see it with one eye but not the other. One eys has an artificial lens, but other people see it as different colors in different eyes.
The Inuit developed special glasses to avoid snow blindness, perhaps a thousand years ago, impressive engineering for a previously Stone Age people prior to contact with Europeans:
They developed them in the same way that John Larkin develops circuits - by a lot of trial and error.
Engineering does involve having some idea about what's going on, formalising that hypothesis and testing whether it works.
If you haven't got a body of theory about what might be going on - what we call science these days - it isn't engineering, but rather craftsmanship which can produce splendid results, but doesn't generalise all that well.
<snip - I don't think Paris Hilton's version adds anything to the exposition>
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