Companies keep trying to make tablets for education happen. Two weeks ago, Acer announced the $US329 ($428) Chromebook Tab 10, a confusingly-named slate running Chrome OS that was designed with students and teachers in mind. Then Apple followed that up with a revamped iPad featuring some new education apps and Apple Pencil support. But to me, neither of these devices truly hit the spot, because they still lack the one feature you need for real productivity: A keyboard.