> As a result of the Big Bang, in almost every direction there is a
> constant but faint
> deep red glow. If you purchase very sensitive PIR detectors, you can
> detect a person
> as he walks between the sky and the sensor (blocking) at several
> hundred feet. Even works in daylight. You will need to search for the
> most sensitive detector; I think only the Japanese
> make them (Hammatsu-sp?).

One of the researchers at the Lab here is using one of those sensors in an 
experiment on the peak of Mount Snowdon in the Welsh Highlands. Something to 
do with detecting atmospheric disturbances of some kind. 

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