Found: Kweneng, a pre-colonial city in South Africa
Hi-tech imaging again reveals a hidden chapter of human history.
- To the southeast of Johannesburg lies a forgotten city.
- Formerly seen as some scattered dwellings, it turns out to be the ruins of a metropolis.
- The past is hidden everywhere, and LiDAR keeps revealing big secrets.
As the cradle of humanity, the little bit we know about Africa's pre-colonial past is not nearly enough. In South Africa, the lack of a written record means that its past remains shrouded in mystery. Recent laser imagery, however, in the southeast quadrant of Johannesburg, at Suikerbosrand National Park, has revealed something striking and massive: a city once home to, perhaps, 10,000 people that's been lost for 200 years.
Its discoverers have given it a placeholder name: "SKBR." However, others have given it another name — "Kweneng."
Satellite photo from 1961 with newly discovered homesteads superimposed. The rectangles show the areas surveyed with LiDAR. Image source: Karim Sadr
"Four or five decades ago, several ancient Tswana ruins in and around the Suikerbosrand hills, about 60 kilometers south of Johannesburg, had been excavated by archaeologists from the University of the Witwatersrand. But from ground level and on aerial photos the full extent of this settlement could not be appreciated because vegetation hides many of the ruins."
With LiDAR scanning, though, a completely different picture emerged. Sadr commissioned its use because he suspected vegetation might be obscuring something significant.
LiDAR stands for "Light Detection and Ranging," and it's been in the headlines before for discovering hidden lost Mayan civilizations in South America. (It's also the primary sensor in many autonomous-vehicle systems.) Sadr explains its function in archeology to africanews.com, calling it a scanning machine that bombards the landscape with laser lights.
"I mean billions and billions of pulses of laser lights, something like four or five hundred per square meter, just all time coming out, and as soon as each pulse hits an object — any solid object, a bird or a leaf or a tree or the ground — it reflects straight back to the machine and then the machine can figure it out where that interception took place in three dimensions," he said. "So when the plane collects all of this data, masses of it, and it comes down to ground... they can project that data."
What’s been learned about SKBR
Suikerbosrand National Park hillside. Photo credit: Skip Russell
SKBR sat on the lower slopes of the Suikerbosrand hills and was occupied from the 15th century until the later half of the 1800s. Its residents spoke the Tswana language.
What's been revealed qualifies the find as a city, not just scattered ruins — there are 750–800 homesteads covering an area about 10 kilometers long and 2 km wide. (Sadr notes that the ancient Mesopotamian city of Ur was considerably smaller for comparison.)
Cattle seem to have been important to the city's residents, as there are stone-walled passageways that experts believe were acted as channels through which herds were led. There are also two enclosures together covering about 10,000 square feet that archeologists suspect were kraals, pens for nearly a thousand bovines.
SKBR status symbols
Map of area shortly after the fall of SKBR. Image source: Wikimedia Commons
At the entrances of some of the larger homesteads are piles of cattle-dung ash combined with livestock bones and broken pottery. "These are the remains of feasts, and the ash heaps' size publicized the particular homestead's generosity and wealth," says Sadr. Similar displays of refuse indicating status have been found in other cultures around the world, such as those in Nigeria and India.
Accompanying the ash piles at some of the larger homes are short, squat stone towers whose purpose isn't known — they may have been burial sites for prominent people or even the former foundations of grain bins, but they do seem to indicate higher community standing.
There's no doubt more to learn about SKBR's past life, but at least it's finally clear, after hundreds of years, that it's there, within easy reach of South African archaeologists and cutting-edge imaging technology.
- 'Lost city' revealed in South Africa using laser technology | Fox News ›
- Archaeologists Have Discovered a Lost Metropolis in South Africa ›
- South African 'lost city' found using laser technology | eNCA ›
What can 3D printing do for medicine? The "sky is the limit," says Northwell Health researcher Dr. Todd Goldstein.
- Medical professionals are currently using 3D printers to create prosthetics and patient-specific organ models that doctors can use to prepare for surgery.
- Eventually, scientists hope to print patient-specific organs that can be transplanted safely into the human body.
- Northwell Health, New York State's largest health care provider, is pioneering 3D printing in medicine in three key ways.
Three academic papers from Australia shows sizable bone spurs growing at the base of our skulls.
- A team of researchers in Queensland says 33% of the Australian population has sizable bone spurs growing at the base of their skulls.
- This postural deformity, enthesophytes, results in chronic headaches and upper back and neck pain.
- The likelihood humans will alter their addiction to this technology is low, so this might be a major consequence of technology.
They'll reportedly last for thousands of years. This technology may someday power spacecraft, satellites, high-flying drones, and pacemakers.
Nuclear energy is carbon free, which makes it an attractive and practical alternative to fossil fuels, as it doesn't contribute to global warming. We also have the infrastructure for it already in place. It's nuclear waste that makes fission bad for the environment. And it lasts for so long, some isotopes for thousands of years. Nuclear fuel is comprised of ceramic pellets of uranium-235 placed within metal rods. After fission takes place, two radioactive isotopes are left over: cesium-137 and strontium-90.
Facebook was careful to say that Libra is not maintained internally and is instead serviced by a non-profit collective of companies.
- Facebook has just announced its new cryptocurrency, Libra.
- Early investors include many of the world's leading companies, implying they will accept Libra as payment
- The announcement was met with a mixed response, but only time will tell how Libra will be received
SMARTER FASTER trademarks owned by The Big Think, Inc. All rights reserved.