The number of interactions per second is calculated as the average for each person interacting with every other person in the population over the time awake during the entire current value of life expectancy.

As shown below for simulation Green (the best match to historical data) using Timelines Version 5, this tracks linearly with world phase until life expectancy starts leveling off and then falling. If the average time awake per day is 17.38 hours for 365.25 days per year at 24 hours total per day, then the interactions per second approximates the world phase minus one over the linear period. Roll over the image for the interactions per second for February 28, 2020 as an average over just one day.

The interactions per second for each year since 1850 are shown below. Note in particular that the recent peak is twice the amount of the last peak (in 1900), and that global consumption of ecological resources exceeded the renewable supply soon after the brief leveling in the 1960s (1970 in Green).


The significance of these observations is pure speculation at this point, but it is interesting to note that the interactions per second prior to decline is close to the empirical number of things people can simultaneously remember (4).
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