Of course that sign was in jest. Apropos roaches, a roach can tolerate 6400 units of radiation without suffering any damage, whilst a human will have difficulty if exposed to over 600 units of radiation.
This is the most beautiful astronomical picture I've found and it will make
you feel strange. The real name of this nebula is Helix. It is also called
God's eye taken by NASA. You notice it does look like an eye looking
right at you.
judy tooley
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