Sthembiso Bokleni turned to the Eastern Cape High Court sitting in Grahamstown after Westbank obtained default judgment against him for not paying the outstanding balloon payment on his car.

You're sitting in a car that's not moving. Also in the car is a helium-filled balloon, which is resting up against the car's ceiling somewhere near its middle. The driver hits the gas and the car ...

The children discover that the cars with two balloons work the best, but could the two balloons be arranged in a different way so that even more of the stored potential can be released?