They Drilled Into a Living Skull — and the Patient Survived

Around the year 1400, a surgeon in the Andes cut a hole clean through a living person's skull — a procedure called trepanation — to relieve pressure from a head wound. The astonishing part isn't that they tried it. It's that the patients lived.

When bioarchaeologists studied hundreds of Inca-era skulls, they found survival rates of roughly 75–83%, and at some sites approaching 90%. Healed bone around the openings proves the patients recovered and kept living for years. Compare that to U.S. Civil War cranial surgery four centuries later, where about half of patients died. The Inca were, measurably, better at brain surgery than 19th-century American doctors.

Hospitals with botanical gardens

Far to the north, the Mexica (Aztecs) ran botanical gardens — like the one at Huaxtepec, established under Moctezuma I around 1467 — that supplied physicians and doubled as places to test remedies. Spanish soldiers who had seen the great gardens of Europe were stunned by them.

In 1552, an Aztec physician named Martín de la Cruz wrote down that pharmacological knowledge in Nahuatl; Juan Badiano translated it into Latin. The result, the Badianus Manuscript, is the first medical book written in the Americas. When researchers later tested the remedies it and other sources described, roughly two-thirds turned out to be pharmacologically active.

The myth, corrected

You'll often hear that "80 to 90% of pharmaceuticals come from the rainforest." That number is inflated. The real figure it's mangling: about 80% of plant-derived drugs whose modern medical use matches the traditional Indigenous use — a sign that Indigenous knowledge reliably predicted which plants would work. That's a more accurate claim, and honestly a more impressive one.