For centuries it was thought that the frontal part of the human brain handled vision (simply because it is near the eyes). Today we know that this part does not handle vision. The part that handles vision turned out to be at the rear of the brain. The front part of the brain is called the prefrontal vortex and is responsible for concocting lies: Pathological liars have more prefrontal white matter.
[Quran 96.16] A lying sinful forehead.
The Quran says that disbelievers will be dragged from there liar forehead, that is, the part where they concoct lies is at the forehead. How could an illiterate man who lived 1400 years ago have known that the front part of the brain handles lies?