The series which explains it all, with Eamonn Holmes and Jenny Hull.

This week including the story of a couple who adopted a disabled baby they met through their work for the charity Romania Concern.

Airbag technology has saved lives, but how does the car know the difference between a harmless pothole, a sleeping policeman and the impact of a high-speed crash. Plus, how do drivers control 140 mph lorries which can out-accelerate a Porsche?