Two South African inventions

South Africans are proud of their inventors. It's almost guaranteed that if you're a foreigner and find yourself talking with South African friends on a harbour pier, at some point someone from the group will mention that it was a South African who invented the dolos (the 20 ton pieces oddly-shaped pieces of concrete seen in the photo).

This bit of information will more often than not be followed up by the story of Ferdinand Chauvier's world-first automatic pool cleaning system, the Kreepy Krauly and how the American company, Zodiac, allegedly stole the South African design, with their Baracuda pool cleaner.

Ironically, I'm South African and I own a Baracuda... which, much to my dismay, sucked all the water from my swimming pool during the night because I left the pump on backwash by mistake! Perhaps it's the Gods of Invention that are trying to teach me a lesson about patriotism. :D