Q1 Descartes said that the only thing that is certain is the existence of doubt. How could he be so sure?
Q2 The freeway speed limit in France is 130 kph. What happens if it rains?
Q3 You normally ride a motorbike sitting on the seat, with feet on the pegs. What happens to the handling and centre of gravity if you stand up on the pegs?
Q4 What problem did the Beefeaters, who live at the Tower of London, recently have with their house insurance?
Q5 How did the 16th-century mystic and spy, John Dee, sign his letters to Queen Elizabeth I?