www.socalphysicsgroup.org/activities/other is part of the website that that tells you when there were lectures on.
Leonard lies to Penny about having to go to a lecture to get out of her One Night Showcase of Rent. Sheldon is very anxious about the lie because if Penny was to go to www.socalphysicsgroup.org/activities/other, click on upcoming events, scroll down to seminars, download the pdf schedule, and look for the seminar on molecular positronium then their lie would be found out.
- The website doesn't really exist
- The seminar did exist on the show, just at a different time. (Week from Tuesday at 6)