I don't understand it easily at all. I used to have daily fistfights with it. But stubborn and persistance wins in the end.<br /><br />I always found, however, the Physics as being easy. <br /><br />Yeah, the Observatory work was fun. I was both a TA for Labs, as well as working our "Public Night." I was the Planet-Guy. I would show you the Moon, Mars, Jupiter and the Jovian Moons, Saturn, etc. Loved it.<br /><br />Got to watch Shoemaker-Levy and the effects of the impacts. That was neat. And I shared a bottle of Champagne with Margaret Geller (PhD, Harvard-Smithsonian Astrophysical Institute) one 4th of July. Very cool. <div class="Discussion_UserSignature"> <p><em>Differential Diagnosis: </em>"<strong><em>I am both amused and annoyed that you think I should be less stubborn than you are</em></strong>."<br /> </p> </div>