Questioning as a teaching technique has been around since the beginning of time.  Early education was composed of questioning because survival was based upon asking questions and developing answers.  Questions like "How far will a spear fly?" is a good question to ask when hunting an animal that sees you as a part of the food chain.  Answers were developed to this question and improvements were made on the spear to the point that the spear became an arrow and the safety range was extended.  Then along came gun powder, bullets and other methods of keeping out of harms way while securing the meat that was needed.  Then came farming as a result of asking many questions about the hows and whys of wild growing grains, bulbs and stalks.  Questions, questions, questions.  When answers were developed to these questions the knowledge was retained and repeated.  This created an information base upon which the next generation of learners could build and add new knowledge. 

Today, the use of questioning as a learning tool is still very effective for both knowledge retention and skill application.  Asking students to explain how certain things work, items relate or components complement is an essential part of the learning process.  Socrates started the questioning method over 2,500 years ago and it is a sound instructional technique still today.  Take every opportunity you can to ask questions of your students so they will see both relevancy and application to what they are learning.