IP247: Exposure counts
Thiophene_ Guy
Times certainly have changed.
Utata's Iron Photographer challenge 247 asked for compositions with:
1 - a clock (on wall)
2 - something that could be used as a weapon (radioisotopes)
3 - b&w
"Laboratory experiments with radioisotopes for high school demonstrations" dates to the 1950s and frequently employs an isotope of phosphorus, examining uptake by plants and fish.
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