I cried when I saw this image

The picture shows Larry Guth, a highly respected mathematics professor at MIT, standing out in the hallway, peering intently through a narrow vertical window on a closed door. Inside the room, his former PhD student, Hong Wang, is giving a mathematics presentation to a packed room. Because the room was full, Guth humbly stood outside in the hall, pressing his face toward the glass just to watch her present her work.