All of the posts on the Current Awareness blog are indexed using a controlled vocabulary.
This means that users are able to filter what they receive by subscribing to individual category feeds. A full list of category feeds can be found here.
Since category feeds are designed to be quite specific we have decided to introduce bundled groups of feeds under broader subject areas.
We are treating this as an ongoing project and will be adding more groups of bundled feeds in the future.
More information can be found on the Bundled Feeds page.