The educational part of this video is great. BUT the introduction with NOISE -- percussion, door knocking sound, etc. -- DRIVES ME NUTS!! Whoever put this NOISE on -- please consider that not all your audience is age 25 or under. When YOU are 79, you will just want the calm presentation part -- you will NOT want a jumpy, blood-pressure-raising audio piece to get your attention. I will avoid RU-vid presentations from this source in the future -- or turn off the sound for the first 2 minutes!!!!
