Microscopes that can look inside human cells and create 3D images of objects as tiny as a ribosome -- with details all the way down to atomic level -- are now a reality. Dr. Daniela Nicastro, Professor of Cell Biology, describes how cryo-electron microscopy works and the ways this technology has allowed scientists to uncover more information about the function of proteins and small organelles. This leads to a greater understanding of various cellular processes and a deeper understanding of diseases.