I'm creating a project using microsoft powerpoint and I'm wondering if you can add video? I'm sure you should be able too,

and if you can, how do you download videos from youtube?
And we will weave in and out of sanity unnoticed
Swirling in blissfully restless visions of all our bleary progress
Glowing in radiant madness
You can embed videos in powerpoint but remember that the video has to be in the same folder as the presentation or it won't show (i.e. it won't become a part of the presentation as such, the file will just open inside powerpoint)

If you use firefox theres a load of add-ons for downloading stuff of youtube.