In the midst of yet another electricity blackout in the Brazilian countryside in 2002, Alfredo Moser, a mechanic from Southern Brazil’s Uberaba, and his friends discussed ways to beckon rescuers during an emergency. During these blackouts, factories tended to have power while homes were left in the dark. Moser and his friends pictured emergencies when homes had no power and there were limited ways to start a signal fire. Moser’s boss offered the idea of using a bottle of water to focus the sun’s rays onto dry grass to light a fire. The thought stayed with Moser and he began to play with the idea of...