This document discusses various theories and aspects of intelligence. It first outlines properties of intelligence such as problem-solving abilities and learning from experience. It then discusses early intelligence testing developed by Alfred Binet. The document also summarizes theories of multiple intelligences including Sternberg's triarchic theory of analytical, creative, and practical intelligence as well as Gardner's identification of eight specific types of intelligence. Finally, it examines extremes of intelligence including intellectual disability, giftedness, and creativity.