The educational world, quite as much as every other sector of society, has fallen prey to the vice of technological determinism. The latest must be the best. No matter the cost (in monetary or human terms) the newest technology demands to be bought. But some of the finest minds in the most prestigious institutions on the planet think differently. Writing with chalk on a blackboard, they say, allows your audience to learn with you, to see the development of your argument, maybe even to appreciate its beauty.

Why is chalk an ideal educational tool?