Living tomorrow. No. 141

Description: Cinemagazine items: Concrete track: a new technique ensuring that rails do not move. The helicopter that flies upside down: its secret is a new rotor head made from titanium. Blind calculation: an electronic calculator for the blind reveals the figures in a series of audible pops and bleeps. Fire extinguisher system for cars: a harmless extinguishing gas is released into all compartments of the car.