height heritability United States Nigeria estimates

How strongly genes affect height depends on the environment

89% U.S. / 62% Nigeria

One estimate put the heritability of height at 89% in the United States but 62% in Nigeria. Nutrition and health care vary more in the Nigerian setting studied. The difference shows that heritability is not one fixed number built into a trait.

A thousand Continental dollars equaled one silver dollar

During the American Revolution, Congress and the states issued Continental dollars without a shared money policy, and neither had the means or will to remove the bills. After the currency collapsed, it was replaced at a rate of one silver dollar for 1,000 Continental dollars. The failure helped prompt the Constitution to bar states from making anything but gold and silver coins legal payment for debts.

Spanish rulers both destroyed and reused quipus

Under Spanish rule, some quipus were destroyed because officials saw them as objects of forbidden worship. Other officials and priests instead encouraged people to use quipus for government and church records.

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height heritability United States Nigeria estimates

How strongly genes affect height depends on the environment

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