  What can physics students learn about science from those scientists who got
the answers wrong? Students encounter little science history, and what they
have encountered typically portrays scientists as The People with the Right
Answers. But those who got the wrong answers can teach students that in science
answers are often elusive -- not found in the back of a book or discovered in a
bold stroke of genius. Giovanni Battista Riccioli, a 17th-century astronomer
who argued that science supported a geocentric universe, and whose arguments
made sense given the knowledge of the time -- is an example of such a person.
