Kurzweil said the brain’s design fits in less than Microsoft Word. Twenty-one years later, the genome held the line. Word did not.
Kurzweil’s 2005 footnote on dendritic spines turned out to be load-bearing — and the same biology now writes English from inside a paralyzed patient’s cortex.
Twenty years on, the anatomy survived. The grand cognitive theories did not.
Kurzweil called the curves on connectomics and brain decoding. He missed on the wires — optic nerve, spindle cells, and millisecond fMRI.
A 1998 migraine pill, an at-home antidepressant trial, and 39 patent grants in 2025 outline a quiet split inside psychedelic medicine.
In 2005, Kurzweil used neuroscience receipts to build an upload argument. Twenty-one years later, seven of ten hold. One is off by two orders of magnitude — and the retinal-implant prediction arrived, over a pile of abandoned patients.
Twenty years after Kurzweil predicted detailed models of hundreds of human brain regions by 2025, the deadline has arrived — and the delivery looks nothing like what he described.
FlyWire mapped 140,000 neurons in an adult fruit fly. MICrONS mapped 523 million synapses in a cubic millimeter of mouse cortex. Neither matches the story Kurzweil told in 2005 about archiving human minds — but the paths we took to get here tell their own.
Nine of ten plasticity findings Kurzweil cited in 2005 held up. The reverse-engineering synthesis they were supposed to enable did not.
Kurzweil’s 2005 brain-scanning scouting report named specific labs. The milestones mostly arrived — through different teams entirely.