Next comes the long wait. Manstein stayed at a hotel near the institute, coming to the laboratory every day to observe the animals, assess key indicators of spinal cord function recovery. To make observations more meticulous, he specifically hired a zoology doctor with deep research into primates as a consultant.
"They can't speak," said the doctor, "but their eyes will tell you, when in pain, their eyes will squint; when frightened, their pupils will dilate; when there's hope..." He paused, "when there's hope, they will look at you, not at food, not at threats, but at you, as if waiting for something."
Manstein recorded this observation in his notebook, drawing a simple sketch of a monkey's eye beside it.
