Performance by Kevin McManus
February 2025
What day is it in the pond?
When I first began to expand my formal industrial
engineering education to include systems thinking
concepts, Peter Senge introduced me to the “29th day”
French riddle. Senge used this riddle to help people
better grasp how quickly exponential change can
affect our lives. His chief concern was that we would
wait too long to address environmental concerns such
as those Frank and Donella Meadows raised in their
“Limits to Growth” work.
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