Travelling with children who ask too many questions about life, the universe and everything? Here is a place that provides answers for them to ponder for a while. Experimentanium is an exciting place where children learn physics, chemistry, mechanics, acoustics, anatomy and whatnot by playing, and indeed experimenting, with a vast number of interactive exhibits.
An English-language excursion costs a whooping R4500, so you might set an experiment on yourself by measuring how much secondary-school material is still deposited in your head and serving as your child's own guide into the world of science.