Over 30 years of dealing with 7-12th grade students, you either turn into a gibbering idiot or a Vulcan. Well, a touch of Klingon helps with some students.

Years ago I read of an experimental power plant that ground those "recycled" plastics into shreds and burned them to run an electric plant. They are mostly made from oil in the first place. But the cost of the special air scrubbers on the stacks and other factors made the resulting electricity too expensive to compete with other methods. Well as political factors increase the cost of electricity maybe it will become competitive again, and we can then burn all that plastic and paper that is going into land fills. Put a power plant by each large land fill and mine your fuel.

The best Yogurt is that which you make yourself. The commercial versions, unless labeled PLAIN, are loaded with sugars and stabilizers and other crap. Add your own organic granola or fresh fruit, and nuts like walnuts or pecans.

Yogurt is easy to make. Heat a quart of milk until it just barely boils. Remove immediately from heat and cool to 115°F. Transfer to a sterile glass container. Add an ounce of plain yogurt as starter. Keep the mixture at 115°F for 12 hours. Refrigerate. If you want Greek style yogurt, strain regular yogurt through a few layers of cheesecloth.

Yogurt is basically fermented milk and bacterial waste. It contains the GOOD bacteria that we need in our guts to digest food and provide healthy immune responses. It is probably the healthiest milk product, and one of the few many adults can tolerate without popping lots of lactase tablets. But it's not healthy if it is full of sugar and artificial flavors and stabilizers.