Here is a very useful article on getting the correct URL to play just an excerpt of a YouTube Video: http://www.techtipsforall.com/youtube-help/embed-part-of-youtube-video-from-specific-start-time-to-end-time/
It also gives you an option to include just the section you want to play in your PowerPoint. What a simple but useful site for people who just want to play a snippet of a video.
Here’s a bit of a YouTube Video from 1947 on being a Medical Librarian. It’s a section from a larger video about the Librarian Profession.
To its credit the video does picture a male in the role of librarian searching for information on “radar.”
Now if you’ve read this far, you’re probably complaining that both videos above look the same. I don’t have the time right now to fix it, but you can do it, just watch this video to learn how: