"Living geiger counters"

[GACarlson@aol.com]

On page 391 of the March 1983 issue of National Geographic magazine is a 
photograph of a flower apparently identified as Tradescantia virginiana .  
Below the photograph is the caption:

"Living geiger counters, the stamen hairs of spiderworts change from blue to 
pink when exposed to radiation and air pollutants."

Glenn
GACarlson@aol.com
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