Through a comment from Mark at Kindernet we now know that it wasn’t Kindernet that was hacked, but some of the sites within the search engine that were hacked. Mark informs us that Kindernet has fixed the problem (read about the problems here). I just tested the fixed version of Kindernet by trying a wide variety of “health education” terms including the terms that generated the inappropriate results yesterday. Kindernet has been fixed and can safely be used again.
The experience with Kindernet over the last 24 hours reminds us that we should always carefully explore any web resource before taking it live into the classroom.