Why does this model of a phospholipids bilayer in Fig. 2 not 'work'? 
Definitions:
Variability
The degree by which data points in a statistical distribution or dataset differ from each other and from the mean value.
Confidence
A measure of the reliability or certainty in statistical results, often expressed as a confidence interval or level.
Aptitude Tests
Assessments designed to measure a person's ability to acquire skills or knowledge, often used in educational and professional settings.
Population Means
The average of all the values in a population, representing the central tendency of the population data.
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