<span>Spearman was an early intelligence researcher. He observed that scores on many different kinds of intelligence tests were correlated</span> Observing that intelligence test items with very different content all correlated, Spearman hypothesized that <span> there was an underlying general factor of intelligence. </span>
You have been living your whole life on a planet. Planets make up solar systems, solar systems make up galaxies, and galaxies make up universes which make up all of existence in space.
