[veddox]

Subscribe to a "serious" popular-science magazine (e.g. Scientific American, or Spektrum der Wissenschaft if you're German). They won't give you a comprehensive overview, but they will pick out recent highlights and offer more in-depth articles on multiple topics, at a level understandable to readers who are scientifically literate but not experts.

Also, see if you can find good blogs by researchers in the topics you're interested in. There are some good ones out there (as an ecologist, I like "Ecology for the Masses"). Their spectrum will be a lot narrower than a magazine - constrained by the authors' expertise and interests - but they can be more "bleeding edge".