I just had an idea for a new form of laundry drier.  It would have a UV emitter, a couple of thousand watts, instead of the conventional heating elements.  A lot of that energy would come out simply as heat, which isn't really a problem in this context; but a lot would be visible and UV, which would be effective for bleaching and sanitizing ( Read more... )

When a statistic is reported as "plus-or-minus X, 19 times out of 20", it means that 1 time out of 20, the value will not be within plus-or-minus X.  (That is, the people who did the survey rolled a d20, and if it came up 20 - or 1; depends on the local rules - they got to make up some other number.)  If the results being measured follow a "normal ( Read more... )