Some of us are young/old enough to have spent too much time browsing through Cryptome archives in the late 90s and being amazed by documents about ECHELON and TEMPEST. Yet, it only took a couple of decades to see those unravel before our very eyes.
Compared to many other security topics, open source information available on electromagnetic intelligence cannot be described as extensive nor comprehensive. Luckily, the talented researchers from Tel Aviv took public research to a new level by demonstrating their 300 USD pita bread.
The setup brings practical attacks to class rooms and coffee shops near you. This time paper and pencil are recommended for taking notes.