Encourage students to take advantage of the free resources available at their local library. They may know they can get books, but they may not know that they can check out movies, video games, use the computer, or join community reading programs (many of which have incentives for summer reading).
Like cabbage and cabbage sprouts, Brussels sprouts are a cool weather crop. They should be harvested when the sprouts are small, compact and bright green. Avoid yellowing sprouts with signs of wilt rot or insect damage. Harvest sprouts when they are no larger than 1 to 1 1/2 inches in diameter.
If your Brussels sprouts are opening, your soil may be too loose and infertile. This plant likes heavy soil, even on the tight side. It's best to mix in lots of well-rotted compost in autumn to give the soil time to settle and firm up. The other reason sprouts can open up: the weather got too warm.