In the fight against severe diseases like cancer, patients often endure a discomforting, weekslong gap between when treatment begins and when doctors can tell if it’s working. The problem often stems from an inability to track the disease’s progression in anything close to real time. Now Glympse Bio, a startup spun out of the lab of Sangeeta Bhatia, the John J. and Dorothy Wilson Professor of Electrical Engineering and Computer Science at MIT and director of the Marble Center for Cancer Nanomedicine, is working to shine a light on disease…