A viral post claims a Nigerian physicist built a portable MRI machine that costs 100 times less than existing models. The real story is more collaborative and more hopeful: a low-field portable MRI machine assembled on site in Uganda by an international team, including Nigerian neuroradiologist Godwin Ogbole, is showing how stripped-down, open-source engineering can bring brain imaging to places where 70 percent of the world currently has no MRI…