The number of bins in this histogram (caffeine content in mg/oz for 65 soft drinks)is consistent with Sturges' Rule. 
Definitions:
Fitness Payoffs
Benefits in terms of reproductive success or survival that result from a specific trait or behavior in an organism, central to the concept of natural selection.
Mutual Benefit
A situation or interaction in which all parties involved gain advantages or positive outcomes.
Lions Hunt
The cooperative hunting strategy employed by lions, often involving a combination of individuals who stalk, chase, and ambush prey.
Fitness Payoffs
The benefits an organism gains from a particular behavior or trait in terms of reproductive success and survival.
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