Birthday

Yesterday we had a decidedly distracted evening, as Digital Electronics turned into Projectile Motion 101. At the same time I introduced the class to a magnetic velocity multiplier (see movie above), and Dave Russell, our professor, showed us all a vacuum cannon that he'd built to use at the high school he teaches at.
And then there was today, my birthday. A lot of talking on the phone to the Katie was involved, both yesterday and today, and for that I say, "Yay!"
My best present by far was the blackboard, pictured above. As you can tell, I went right to it, working out part of the math for the magnetic velocity multiplier I mentioned before. I find it very interesting that you have to prep the board by rubbing it with chalk and then erasing it so that the first marks on it will not be indellible. I must research that further.