The number of bins in this histogram (caffeine content in mg/oz for 65 soft drinks) is consistent with Sturges' Rule. 
Definitions:
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air and is absorbed by plants in photosynthesis.
Sea Levels
The average height of the ocean's surface between high and low tide, used as a standard in measuring land elevation and ocean depths.
Market Failures
Situations where the allocation of goods and services by a free market is not efficient, often leading to a net social welfare loss.
Environmental Regulations
Laws and rules designed to protect the environment that set limits on pollution, require permits for certain activities, and impose penalties for violations.
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