A search by plan (2)

In the first part, we discovered an area of harmful waves on the grounds of a school. The question now is: exactly what are these waves, and how can we protect ourselves from them? To do this, we bring out a tool devised by Louis Turenne that has been little used until now – the ‘disc of diseases’ – and then, using four simple tubes of water, we construct a genuine Faraday cage for waves… the effect of which we check on the map 24 hours later.