This article is a revised version of a talk given to the Mathematics Club at the Technion, Israel's Technological University and subsequently printed in Etgar-Gilianot Mathematica, the Israeli version of Parabola.
Issue 2
I know what I am - I'm an actuary. But how many other people know what an actuary is?
Issue 3
Early in the 17th century, Johannes Kepler established, from actual observations of the position of planets in the sky, three laws of planetary motion.