1.
measured the circumference
4.
wrote a geometry textbook
5.
made first steam turbine
6.
title of first geometry textbook
7.
supported the heliocentric theory
8.
earth was the center of the system
9.
sun was the center of the system
10.
Roman contribution to health
12.
made first water-clock
13.
Alexandrian astronomer
14.
used by ancients to relieve pain
15.
used by ancients to soothe irritations
18.
famous 20th century doctor
20.
famous 20th century author
21.
student whose father is a doctor
