CLICKERS:
Students need to buy clickers at one of the bookstores for this class. 
See www.iclicker.com
Register your clicker!
Re-register it if you registered it over six
months ago - registrations can lapse!
Use your U. Louisville student ID number (7 digits) when you register. Clicker responses count toward the participation grade (5% or a about
a third of a grade) and also are used for mini-quizzes.  You can sell
them back at the end of the semester.

For an extra credit assignment, you should get a planisphere at the UL bookstore (about $2-2.50).