How endogamy made India's caste system hereditary

Marriage within groups helped make caste hereditary

Marriage within the same subcaste helped turn India’s caste groups from temporary job roles into identities passed from parents to children. Over generations, this helped make the caste system harder to change.

The Wright brothers patented aircraft control, not flight

Before their first powered flight, the Wright brothers filed a U.S. patent for a way to control an aircraft—not for a flying machine itself. Their three-axis control system made fixed-wing powered flight possible and remains standard on airplanes.

Early AI found algebra easier than recognizing ordinary objects

Early symbolic AI could solve algebra problems and some IQ-test questions but struggled to learn, recognize objects, and use everyday common sense. Computers found some tasks people consider intellectually difficult easier than basic abilities humans perform almost automatically. This is called Moravec's paradox.

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How endogamy made India's caste system hereditary

Marriage within groups helped make caste hereditary

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