First, they will offer the child individual attention. Second, they will possibly offer more patience than could be expected from the average teacher. Thirdly, they will offer immediate feedback so that children know how well they are doing and can take pride in their progress. Finally, the machines will help make learning fun.
Beavers do a lot of good work when they build their dams in the right places.
First, beaver dams slow down the rush of water in brooks and streams. Brooks that otherwise would dry up in the summer flow all year 'round if a beaver dam is built across them. Next, the trees and bushes near the brooks have enough moisture to grow well. Their roots hold the soil so it does not wash away. Also, wells that usually dry up in the summer hold water all year when beavers are put to work on nearby streams.