Yes, this is exceptionally long. But it is really well done. You might not be able to watch it today, or tomorrow. But if you get a chance, sit down to listen to Randy Pausch give his very last lecture.
Category: Quickthoughts
Rock Challenge.
I think Irene in particular will enjoy this challenge.
New Math
This is an amazingly fun video.
Sand art
Novel at first, but the themes repeat a bit.