According to Kohn, teachers should only assign homework when they can justify that the assignments are «beneficial» (2006a, p. 166)-- ideally involving students in activities appropriate for the home, such as performing an experiment in the kitchen, cooking, doing crossword puzzles with the family, watching good TV shows, or reading. (ascd.org)
A collection of crossword puzzles with answers to support the learning of some KS3 Science units. (tes.com)
The New York Times Crossword Puzzle for Android allows you to do the Mini puzzles for free and has a subscription option to do the full puzzles for $ 6.95 / month or $ 39.95 / year. (goodereader.com)