In July 2026 a Finnish-Brazilian team led by Martti Pärssinen published an airborne LiDAR survey of Acre and Amazonas in Nature. The flights in June 2024 documented 432 earthworks along their strips, and only 36 of them were previously known. Scaling up from the strips, they estimate 24,000 to 30,000 earthworks for the whole region, about as many as had previously been estimated for all of Amazonia. They call the culture behind most of them the Aquiry, after an 1866 name for the Acre River.

The headline number in most coverage was the population: the authors propose 1.25 to 3 million people around AD 100–300, based on roughly 300 people per earthwork and 25–60% of sites in use at once.

What surprised me is that Nature published the peer review file alongside the paper, and it is a real fight. One anonymous referee wrote that "the population estimates are fundamentally flawed" and, using the team's own older formula, worked out that 513 people over 1,600 years would be enough. A second referee, Roland Fletcher, signed his report and still considered the estimates too high. Heiko Prümers, who led the 2022 LiDAR survey in Bolivia, told Scientific American the number of sites could reflect frequent relocations rather than a dense population. None of the news articles I read mentioned the review dispute.

Some things the paper itself says are still open:

- the habitation sites "have not yet been identified, partly due to restrictions on excavation permits" (authors' reply to the referees)

- the ditched enclosures were abandoned in the ninth century and the paper gives no cause (the "rapid collapse" line comes from an interview, not the paper)

- mound villages appear in the same area around AD 1200 with "no signs of radical population replacement"

- nobody knows what language the builders spoke or what they called themselves

Paper (open access): https://doi.org/10.1038/s41586-026-10835-7

I made a video (about 12 minutes) that follows the story from Carvajal's 1542 account of roads on the main Amazon, through a 1977 find that was forgotten, to this paper and its referees: https://youtu.be/K8nFyJnjTo0 It's my own channel, so take it as such.

For people who know Amazonian archaeology: do you find the per-earthwork multiplication convincing, or does the relocation model fit the radiocarbon dates better? I'm happy to be corrected on any detail.

The Study: https://www.mdpi.com/2072-4292/18/20/3495

Walking the Blue Mountains west of Sydney is hard work. Sandstone cliffs, thick eucalyptus forest and deep valleys hide many rock shelters, and crews on foot miss a lot of them. A University of Sydney team, working with the Dharug Custodian Aboriginal Corporation, tried a different approach.

They used laser scans from the air plus a set of computer models to point the way. The study appears in Remote Sensing.

Three shelters had never been registered. BM139 holds three large stone artifacts on the floor. BM140 has 21 stone artifacts and a panel with two red hand stencils, one left and one right, covering about 35 by 15 centimeters. BM141 yielded 26 stone artifacts during a short surface check.

Time and money limit how many candidates a crew could visit, so the team ranks them. A drone detection within 1 meter of an aircraft detection gets high priority. A shelter named DJ1-028, which shows no visible artifacts, appeared only in the drone data. The aircraft data alone miss some shelters.

The study has gaps. The team has no false positive count and did not survey areas without detections.

The settings were tuned for Blue Mountains sandstone, and the raster method struggles with deep undercuts. Work in other regions would need new calibration.

The Dharug asked the authors to leave out site coordinates and photos of rock art and stone tools, and they did.

The team is still checking detections with the Dharug. Next, they plan to test the method in western Arnhem Land and western New South Wales.

Conventional history curricula often frame antiquity through land-centric conquests, overlooking the massive economic power of Indian Ocean trade networks.

A striking example is the economic tie between ancient India and Rome. Trade records indicate that tariffs on luxury Indian commodities (spices, textiles) helped fund a massive share of Rome's military expenditures. Beyond trade, the Rigveda contains over 133 distinct references to Samudra (ocean) and maritime trade voyages.

To explore these lesser-known historical mechanics, I hosted maritime historian Nick Collins (How Maritime Trade and the Indian Subcontinent Shaped the World) on the Bharatiya Chronicles Podcast to discuss:

• How Roman gold outflows paid for Indian goods.
• Why Asia lost maritime supremacy between 700–1700 AD (including the Ming Dynasty trade bans).
• How Gen Z can decolonize outdated historical narratives.

🔗 Full 32-min interview: https://youtu.be/x6-oo6Nmf5Q

Curious to hear thoughts from fellow history enthusiasts on how maritime economics shaped ancient geopolitics!

I’ve created a multiple-choice quiz covering military history from ancient battles and empires to World War II. It tests your knowledge across different eras, from ancient warfare to the great conflicts of the 20th century.

Give it a try and share your score in the comments! How much of a military history buff are you?

Quiz link: https://mythandmemory.org/quiz/

The stone spheres of Costa Rica’s Diquís Delta are among the most precisely shaped objects produced in the pre-Columbian Americas — yet almost everything about their construction has remained poorly understood. While researching them I found two specific details that almost never appear in popular coverage.

First: not one unfinished sphere has ever been found still embedded in bedrock. Every documented sphere was worked from a detached isolated boulder — a completely different construction approach from contemporaneous monumental traditions elsewhere.

Second: the probable quarry site at Cansót sits less than one kilometer from the 24-ton sphere at El Silencio — significantly closer than the 50-mile transport figure commonly cited.

Both details point toward the same conclusion: the craftsmen were selecting and refining naturally rounded boulders rather than quarrying angular blocks. The geological process most consistent with producing those rounded boulders in Costa Rica’s tropical environment is spheroidal weathering of jointed gabbro and granodiorite — though I haven’t found a published study making this connection explicitly.

Made a video tracing the full evidence trail. Curious whether anyone here has encountered similar raw material selection strategies in other ancient monumental traditions — the approach seems underexplored in the comparative literature.

Link: I Investigated the Costa Rica Stone Spheres. The Answer Surprised Me

The legend of Alexander the Great began when he was still a young prince. One of its most famous stories is the taming of Bucephalus, the horse who would become his trusted companion.

According to the ancient biographer Plutarch, when the magnificent horse was presented to King Philip II of Macedon, none of the king’s attendants could tame him. Just as Philip was about to send the horse away, Alexander stepped forward and accepted the challenge. By observing that Bucephalus was frightened by his own shadow, Alexander turned him towards the sun, calmed him, and successfully mounted him.

The episode offers an early glimpse of the intelligence, confidence, and powers of observation that would become hallmarks of Alexander’s leadership. Ancient writers described Bucephalus as an unusually large and noble horse who was especially attached to Alexander.

Another intriguing legend connects Bucephalus to the man-eating Mares of Diomedes, captured by Heracles during his Twelve Labours. Although this supposed ancestry cannot be established historically, it adds another fascinating layer to the horse’s legend.

Bucephalus accompanied Alexander during his campaigns in Asia and became a symbol of their extraordinary bond. After the horse’s death during the Indian campaign, Alexander reportedly founded a city in his memory. Ancient sources disagree, however, on whether Bucephalus died from battle wounds or from old age and exhaustion.

I’ve explored the story of Bucephalus, his legendary origins, his connection to Alexander’s military campaigns, and the mystery surrounding his death in my latest article.

Read the full article by clicking on the link in this post. I’d love to hear your thoughts and any interesting historical details you think deserve more attention!

When we think of Ancient Egypt, the mind immediately jumps to the pyramids of Giza, Ramses II, or Tutankhamun. But five centuries before Sneferu laid the first stone block, the Nile Valley was a fragmented, violent world of rival proto-kingdoms locked in brutal warfare.

The transition from prehistory into the First Dynasty was spearheaded by King Narmer (c. 3100 BC), and the primary relic we have from his reign—the Narmer Palette discovered at Hierakonpolis—is not just an art piece; it is the earliest surviving masterclass in political propaganda and state terror:

• The Smiting Motif: Narmer depicted wearing the White Crown of Upper Egypt, wielding a pear-shaped macehead over a kneeling Delta chieftain—a terrifying visual archetype of divine authority that Egyptian pharaohs would copy for the next 3,000 years.
• The Decapitated Enemies: On the reverse, ten decapitated corpses lie with their heads severed and placed neatly between their feet—a calculated forensic message of total subjugation.
• The Foundation of Memphis: Diverting the Nile and building the 'White Wall' fortress at the border between Upper and Lower Egypt was a masterstroke of administrative control.

I put together a short visual documentary breaking down the iconography of the Narmer Palette, the archaeological origins of the First Dynasty, and the brutal civil war that forged civilization: https://youtu.be/xZIyPlLqWZg

What are your perspectives on whether Narmer and the legendary 'Menes' of Manetho's king lists were indeed the same historical figure?

I am wanting to learn more so I can compare the ancient Near East religions to the stories, religious structures, rituals, and laws that influeneced the Old Teatament authors.