New Delhi: Dr. Padmavathi R., professor of pathology at Madras Medical College, has been working in her field for over 20 years. Her career went up, and so did her back pain. As a pathologist, her day ...

It’s relatively easy to understand how optical microscopes work at low magnifications: one lens magnifies an image, the next magnifies the already-magnified image, and so on until it reaches the eye ...