c. 1925 – Radio
<img class="aligncenter size-full wp-image-11360" title="radio" src="http://edudemic.com/wp-content/uploads/2011/04/radio.jpg" alt="" width="600" height="377"/>New York City’s Board of Education was actually the first organization to send lessons to schools through a radio station. Over the next couple of decades, “schools of the air” began broadcasting programs to millions of American students.