This episode is devoted to "spectroscopy," when you toss light at a sample and see how the sample responds. We talk of infrared spectroscopy, ultraviolet-visible spectroscopy, far-infrared spectroscopy, and microwaves. All of these types of light affect molecules--in different ways--and we learn how, and who was instrumental in developing each type.Support the show Support my podcast at https://www.patreon.com/thehistoryofchemistry Tell me how your life relates to chemistry! E-mail me at steve@historyofchem.com Get my book, O Mg! How Chemistry Came to Be, from World Scientific Publishing, https://www.worldscientific.com/worldscibooks/10.1142/12670#t=aboutBook