This document discusses data logging and measuring the speed of sound. It describes data loggers as electronic instruments that can take sensor measurements and store the data. It then discusses the process of data logging using computers to collect data through sensors, analyze it, and save and output the results. The rest of the document describes an experiment using a virtual oscilloscope to measure the speed of sound by placing microphones 1 meter apart and bursting a balloon to create a sound, measuring the delay between the sound reaching each microphone.