Although many experimental assays are performed at room temperature (RT; ~20-25°C), it is not uncommon for experiments, or parts of experiments, to require some type of temperature regulation. This video discusses the different reasons for and temperatures at which a scientist may want to "keep things warm". For example, sometime, cells need to be cultured in an environment close to body temperature (~37°C), protein structure needs to be modified (>56°C), or reagents and solutions need to be heated (~100°C). Also discussed, is the proper way to handle a thermometer and measure the temperature in stirring liquids. Since it is not always obvious how to regulate temperatures in the laboratory, this video will also talk about what types of equipment one might choose in each situation.