Chapter 4 read section 1 and do question 1-5, Due Thursday.

Class Discussion and NASA Video on "What is a Planet?" The text book is out of date and the Pluto dilemma continues...but what if we discover more planets....then what? Science is advancing so quickly now that its almost no use to put it into text book print form.
Class Experiments on

Benham's Disk Experiment on the eyes Rod and Cones
http://faculty.washington.edu/chudler/benham.html
http://www.illusions.org/