Starting July 2021, Google's Feedburner service will no longer be supporting email subscriptions. (Note: the Feedburner feeds themselves will continue to function, but certain features such as RSS-to-email are being discontinued.)
As a result, ScienceDaily will no longer be able to send out any of our email newsletters using Feedburner.
We are currently looking into alternate email subscription services, and we hope to resume sending out our newsletters in the near future.
In the meantime, our RSS newsfeeds continue to operate. These feeds provide essentially the same information as the email newsletters. There are a number of apps (commonly called RSS readers) and other third-party services (e.g., news aggregators) that can be used to follow RSS feeds.