AARP Hearing Center
Periodically they delete older videos and add new videos. They also sometimes change the frequency of videos (moving from daily to weekly or monthly). But instead of deleting old and adding new all at the same time, it looks like they delete all of the old videos they want to and then add the new videos in small batches over a period of time. And I don't know if they end up adding as many new videos as the number of old videos they deleted.
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