Most interesting or lesser-known inventions by South Africans?

Dodgy ANC aligned accountants and auditors invented the phrase 'Fruitless and wasteful expenditure' to cover for their party's blatant thievery. It successfully entered common parlance and nobody bats an eyelid.
 
The CAT scan

The Computed Axial Tomography scan (CT scan), better known as the CAT scan, was invented by Allan MacLeod Cormack. He shared the 1979 Nobel Prize in Physiology or Medicine with his associate Godfrey Hounsfield for his work on X-ray CT.
 
200K for a Mop that cost 40 Zar at Makro
or was it 25K for Each lightbulbs that cost peanuts as thats the maximum you could get without too many eyebrows being raised.
 
South African engineer George Montague "Monty" Pratley invented Pratley Putty in the early 1960s. He developed the world's first epoxy putty with the assistance of chemist Frank Robinson.
Even NASA used it
epic bragging rights
 
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