I read the book “Click Clack Moo, Cows That Type”, Â by Doreen Cronin. Illustrated by Betsy Lewin . Â The book tells the story of Farmer Brown’s cows, who find an old typewriter in the barn and proceed to write letters to Farmer Brown, listing various demands. Â I then brought out a manual typewriter and explained that these were used to type letters before we had computers. Â The children have had several classes to experiment with the typewriter!