You know, the ones about how neither energy nor matter can be created or destroyed?
It must, because I'm quite positive that in the last 5 weeks, entire days have been AWOL. Really, if 35 calendar days have passed, I would have gotten tons more work done! I'm onto them, though. They're right there in the middle of those lectures that claim to last only an hour by the clock, but that seem to drag on for a week!