Is blood thicker than water?

In 1964 biologist William Hamilton introduced Inclusive Fitness Theory to predict and explain phenomena ranging from animal behavior to patterns of gene expression. With its many successes, the theory became a cornerstone for modern biology. In August, 2010, Harvard researchers challenged the theory in the prestigious journal, Nature. Now Nature has published sharp rebuttals from scores of scientists, including Edward Allen Herre and William Wcislo, staff scientists at the Smithsonian Tropical Research Institute.

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