"Many teachers are concerned about the amount of material they must cover in a course. One cynic suggested a formula: since, he said, students on the average remember only about 40% of what you tell them, the thing to do is to cram into each course 250% of what you hope will stick."

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I don’t recommend that average iPad Air owners upgrade to the Air 2. But what about the vast majority of iPad owners who own older models? That’s a different story. If you have an iPad 2, 3 or 4, the new Air 2 will make a big difference. Its thinness and lightness will be a dramatic change, and it will be faster and more fluid. However, here’s the catch: Upgrading to last year’s iPad Air would have pretty much the same effect, and that model is now, suddenly, $100 cheaper, starting at $399.

— Walt Mossberg