This third edition volume expands on the previous editions with new discussions on the latest techniques and developments in the field. The chapters in this book are organized into four parts, and cover topics such as optical tweezers; single-molecule fluorescence tools; atomic force microscopy; magnetic tweezers; applications to virus protein shells, unfolding of proteins, nucleic acids, motor proteins, in vivo and in vitro; and protocols to establish specific surface interactions and perform force calibration.