The leaning bell tower of Pisa was finished in 1350, is 179 feet high, and leans more than 15 feet out of vertical. From its top, Galileo reputedly dropped two balls of different weights to find our if the heavier fell faster. See this issue's "Panorama" for more about that experiment.
TABLE OF CONTENTS
Mercury: The Swift Messenger
by J. Timothy Unruh
Heavier Objects Fall Faster
by J. N. Hanson