Astonishing ancient world scientists

Scientific inquiry is not a modern phenomenon. People have always been curious about the world around them. To that end, some people stepped forward and used logic and reason to solve the mysteries of the natural world. Author Amy Graham profiles eight of these scientific pioneers: Pythagoras, Hippocrates, Aristotle, Archimedes, Galen, Ptolemy, Zhang Heng, and al-Khwarizmi.