“The results demonstrate that Homo sapiens during the late [Middle Stone Age] mastered precise, pre-planned patterns anchored in specific geometric affordances: orthogonality [meaning the use of right ...

Mlodinow's background in physics and educational CD-ROMs fails to gel in this episodic history of five "revolutions in geometry," each presented around a central figure. The first four—Euclid, ...

Parallel lines close parallel lines Lines which never meet and stay the same distance apart. Parallel lines are indicated by a pair of arrows. are two or more straight lines that remain the same ...